Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48c3d4f4f2a3f1e…

MALICIOUS

PDF

90.6 KB Created: 2021-06-26 15:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 36bbd6dd51025e0a338eb9063562cc6a SHA-1: 5309dbc495323078e3841588368aab3a7a144ede SHA-256: a48c3d4f4f2a3f1eab825e88826c279989b1979b41819b5bbb7961f0190d2f17
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links to external sites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm designed for phishing or malware distribution. Notably, the file includes an instruction to disable security software, a strong indicator of malicious intent. No scripts were extracted, but the overall structure and URL patterns point towards a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=you+require+permission+from+laptop+to+make+changes+to+this+folder PDF link annotation
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/5oio56i9hlosfnp16t1nituta4/fanezogikisowejaluvudev.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/94788b1ce15b0c8199a171681b11916e/57504007639.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021042914163991.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/83093994496.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160702c7bb90de---zepebelobosugok.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/nodebifisabap.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/2a2a52a23f59bc4545c892e9bc94a262/mebulexazine.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160bb43bf68ec8---8095170814.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ead9d23238640300c9ee1d71bd932ba4/nusarezewukiwakutafopabu.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b05613993b---ragejerapejaze.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/15658380691.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790fe3dc640---xesivu.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/l04jhogd6650gu1t9077ssi2vt/79811094051.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb946042f6d---38149594279.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/9tmkh33b8ud9c9rt49t1rng2i2/taregorib.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/1b0738m4ob0t2i7b3f0uco4qkg/49317606114.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/916bc0530c6a61e22aa0f5e4c2589985/xazix.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c15b6ce0cac4b652963cfebd2b13b0db/92313315309.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/om52bjab6eaq1couhn3p2br8af/65584676656.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/8fee4b1ea65c06a9071e25e388deb0c2/lawuzojawojolosoloduju.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/efvlq2biciidh1lskp79qeamo6/79882399961.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/1243656e85ad73bed4de321d06a4b228/muminijisojuwukadumuta.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8a328ae15---45667809511.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E9 27380 bytes
SHA-256: ecdafe253b630cb0114429ee5eb83cf153f7589e81d5845c8a951c8fc7afa280
font_01_sfnt_off00012a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14272 11388 bytes
SHA-256: e12d292bde212dc8a3489785b311b3685504c7d8af754d36d63e3d4cd06c77ec

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