Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d33071c5777035…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 08:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d2b6e2a400d3879a3bb99de8c6e86b88 SHA-1: 27c2d1780526c06a684f1cdbdb8e4b53a6599095 SHA-256: b0d33071c5777035052cb5a3e3aad4a9645b62748df3e3383fdb38a35f701fd5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and link farm structure are indicative of an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://smidgel.ru/uplcv?utm_term=ads+keep+popping+up+on+chrome+android PDF link annotation
    • http://designerhouse.ru/upload/files/gisusisuwefusaxevuno.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16142820fbbd19---24033057125.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161376ead5de33---bokegudevuseg.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613acb5760ad8---2384797175.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/zetolekomuf.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/558d6c3733f25877da7c5f07a7296860/fisisosubagovef.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/69907212620.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c0b02e9ba---70721927451.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/kinajikefanekizekegovoj.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/97201665955.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161395cb4a467a---zuxowugob.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/zewodorilamixag.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/6739334239.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/kevukavipaje.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/8559a0afee63bedcb92fec2f317073b4/miwib.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/loxapevadegofozu.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/80970608833.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/wubat.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gilex.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/rozadizuxode.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613871dd94d27---kunonaligijebofijuto.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/miveligoxovezelata.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/fomidaxapesudojewi.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/wolov.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_off0000d600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD600 10992 bytes
SHA-256: 01ec3de7eea7f535e39cc5cac72840afa9a1b1c74d0065dea20054d2b32363cc
font_01_sfnt_off0000ef21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF21 18244 bytes
SHA-256: 7e4089479d4cf82e45f124bcb63383e1a8eedb88af56155cde0e1ef52787178b
font_02_sfnt_off00011e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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