Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb67c2063c1ef56…

MALICIOUS

PDF

95.9 KB Created: 2021-08-26 05:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fc3d308aa09adf5d00859484a689be8f SHA-1: 09927c86b9a55cc27b31ef66b21094c0ecd565fc SHA-256: 7bb67c2063c1ef564cc13281839fb2d2ae79f2e0d95bba12117f1544dd5e7f2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/vqaacgvkskqcbmphho1jtcs275/xugoz.pdf In PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab35a453dd6---57867439045.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/57823476470.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/difibiguf.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/66195dc5e6be3c53d8062e5436c5da71/dojeg.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/20110033874.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/keroludurujigozopukewuwuf.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/puwonel.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/ab2f5e2d67c8c193db9a5327c500f01c/kewokajed.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/cc0ea2c76bf6653fdff5f94750252d22/72742973597.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2b6a63174479c38326dfaecd22c14a9d/monolerogaxixatudezug.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cbc0749b7---zakusekilulutaloposiwujed.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/932214479.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210614204522.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/49611492339.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5f583a5cf---57438296694.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/73814574e4d34ba19669185feb846247/5524379837.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d3be27e3ea0d92e1c233e0abf8fc88bc/64783423227.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/80975420985.pdfIn PDF document text
    • http://liyangah.com/Upload/file/15379600791.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/5fdba74ad56e23d264fb966bf786643c/85430045286.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/dosiketadupofule.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210724_3998DBA74F9A5BC3.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/518878e4573216b8ed33a3b95f15fe13/ritadate.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/95b7ec01d5d8b0c0ed58a18238781e1f/47661983547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=being+seductive+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00011b0e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11B0E 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000dd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3A 10664 bytes
SHA-256: 9ee533e6eded873defe265692d9b9a71e5a303ecca4d7cfdd8fff4c6da187f92
font_01_sfnt_off0000f57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57E 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_02_sfnt_off000102fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000138ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AB 22536 bytes
SHA-256: 3b5bac96c7de94b7f74e5716accf0b60ac617f270390472a6da4737ac9882d84

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