Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c049b018bd9048…

MALICIOUS

PDF

97.5 KB Created: 2021-09-23 02:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ad1541d44b2b0e5dd63f4146634e0542 SHA-1: c2751be4e0bd302e7e3feb9ae77877d46365d5ae SHA-256: d2c049b018bd904839d028ddfd06edf4d496035120e6a3b25442aa9663ecdcd9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing or malware distribution lure. It contains a link farm pointing to numerous domains, including compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of malformed streams and ML classifier flagging further supports its malicious nature. No scripts were extracted, but the structure and URL patterns indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://infrive.ru/uplcv?utm_term=thunderbird+android+apk PDF link annotation
    • https://33mobility.net/uploads/files/43496613225.pdfIn PDF document text
    • http://maxbrio.kr/files/files/vefok.pdfIn PDF document text
    • http://floramarble.com/uploads/kotejojirepidijopanar.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/60788172467.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/nabamefoz.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210906081035.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/c1bb2d73950242ed7884d3528e571bf3/37614554110.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/25accb74bbc023170893a90e59cccf04/42558759953.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/45aefd0a2b61e4441bd75230667c69e1/46849902902.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/63422414745.pdfIn PDF document text
    • http://watch62.ru/files/files/5901449759.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/8212602365.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/81421495606.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/89252200057.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/gexajitumanukuv.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/15573821404.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137f0a2a1201---zupowolajeguxelas.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/30222230878.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/ruxejojuvurukezebitu.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/25142875628.pdfIn PDF document text
    • https://majubesar.info/contents/files/zikutikixefeleramavogap.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161448663ef672---59922034388.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/ruxaxojuduvakolese.pdfIn PDF document text
    • http://videlec.be/ressource/file/56543080677.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/rewelulelo.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11055 10472 bytes
SHA-256: c6f73311c5af12f6cc741a832e8ba7f34da57a4b4446da316f98a82f4eb1bcc1
font_01_sfnt_off000127b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B2 20932 bytes
SHA-256: 9cee16543bdb9123a78cadf34be2bdca34eb22c2e7947aa90235272e910bb009
font_02_sfnt_off00015eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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