Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c89578744cda049…

MALICIOUS

PDF

76.5 KB Created: 2021-09-07 11:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b83b517e0c8682b24cbe85187e9e9048 SHA-1: 1aacbec6d0e8e160d5776165491c1522001dd602 SHA-256: 3c89578744cda049561862bd7ba6713361748e5919f2fa73f1175c53c6665938
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as a phishing trojan. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://xn--80aikni6a0b.xn--p1ai/images/file/98798553807.pdf In PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/kevtnoct30i39iq7u1h83bu9d9/nezaxemigave.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/47783529334.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/61325209482.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/resutaridurafakonalowi.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/86694189140.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/detudenadusovudasaranam.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/54584705297.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c908801814---tatigurelofulo.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0839adbb6---zisififoviv.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7340a9798d---36325670049.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609c297ce7549---98524890375.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079cd42abda0---wetasolojesoditonerifum.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/jipemorojodo.pdfIn PDF document text
    • https://renault-service.com/userfiles/fepepomusajidewobunopa.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60d59cc797297.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/duragefa.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098445ccc8a6---14113374824.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/96176090299.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/vorag.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/79fb6ba5ec2603930bf3ddf0f35586c6/paganifi.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/a17b52343ca27c987a02e0fcd949f851/pabedutilefibid.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/24449161066.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/nomeker.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/0fd0896bfff6fb5c354b85420d2777d2/suxabetiwabofenerewaru.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-6-27/20210627185226181007.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608622836893f---42363709390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=clasificacion+hipoglucemiantes+orales+pdfPDF link annotation
    • 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_off0000c567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC567 16956 bytes
SHA-256: a455547a56cbe24565c420b3ca8c88fdede7a1bfa2986b465e2606aac48dd1f1
font_01_sfnt_off0000f05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05B 11200 bytes
SHA-256: 5e02a8ef30e69576ef1abfd4d705199061d8281963dbf6da6d310383eebbee14
font_02_sfnt_off00010a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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