Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e1574cb721f412…

MALICIOUS

PDF

96.8 KB Created: 2021-07-19 19:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cdc328cbb0a1cff47658ddd7f7d9e842 SHA-1: 2d1d27249278c5196f13243a6d83c86003eb08f8 SHA-256: 19e1574cb721f4123b11c615356fcb1a7ef4d5147e918c06505316c079069523
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. The document body is heavily obfuscated, but the presence of numerous embedded URLs, some pointing to compromised CMS upload storage, suggests an attempt to redirect the user to malicious content or services. The heuristic 'SE_CALLBACK_LURE' strongly indicates the document's intent is to trick the user into calling a phone number for fraudulent purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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 http://www.ecvbrass.ch/user/web/file/21991470734.pdf In PDF document text
    • https://techielingo.com/fck_uploads/files/sibageruxew.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa6ab1817e---nixuza.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/94867073741.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cad6364a0b7---42581008990.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/4uudvpq5407rolgq05eb7or4q2/29004212407.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/94145872053.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/fudifipakikilumakujis.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/julekuxipemewategite.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/lufiz.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/4491a6c8acabb33e91db8fe47e0184fc/69874809751.pdfIn PDF document text
    • http://skupka54.ru/upload/m/2075178182.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/daa55b5234f6235147d32642b2b56f70/1424235879.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb137361f5b---28206753733.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/e8bf8bb4d32b029f3fae90acec9e9b01/gibiwaku.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/luvuxulesopobuziketulu.pdfIn PDF document text
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/60824827522.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/91e73a3d7896f33771260b1f15530eb0/rizusalepopa.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/69899147973.pdfIn PDF document text
    • https://strechybenesov.cz/content/vasuvesoduritit.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/63521102140.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf946ebbc7---16097780264.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/203360970860a2b5e9ba83a.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/dakekijoxopufovaxulekoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=new+eviction+lawsPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/2827e2ed06fa6ae5bcac89cdf14463c6/54709495625.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_off00011a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001321b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321B 17368 bytes
SHA-256: 9454c0ca6b5389807506c1eca00bdabfcac70e24dde7bcd250a35902805c04df
font_02_sfnt_off00015f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F09 10252 bytes
SHA-256: bc71f0e021350aef15a28d348961d4e677f2a054049e474e72649f49adf8963a

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