Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bd5af5acaaf63eb…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 20:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9009a8bc35e4b65bd8b523454d0fa671 SHA-1: d6ce5c8e21ef323baf128f9da3b504f03628b963 SHA-256: 0bd5af5acaaf63ebb59ed40057899399f93d396bcf1700ed4c5693c452ba2986
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with the ML_NYX_PDF_MALICIOUS and ClamAV detections, strongly suggests malicious intent. Although no scripts were explicitly extracted, the structure and heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://catamma.ru/uplcv?utm_term=free+youtubeto+mp3+converter PDF link annotation
    • http://ranahytta.com/ckfinder/userfiles/files/57899734589.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613132e293bd9---25635646831.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/15214554225.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/16315917578962067387.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/jolakunid.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/8f526820494c975327d722f81461a6bf/52633659300.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/84165442856.pdfIn PDF document text
    • http://erex.hu/upload/file/95978664720.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/30047946039.pdfIn PDF document text
    • https://investkwik.com/userfiles/file/mugewudomisawiduromo.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/tusafava.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091004140466.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/kofakam.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/kupowugatoronaduram.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/mufosigazunizavamawejobu.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3ae80e703---98055458053.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210906172741.pdfIn PDF document text
    • https://schmitz.cz/res/file/xudonamevotawegawoxubime.pdfIn PDF document text
    • https://diphong.com/uploads/43161217496.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/sofotetebapupija.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/46484159078.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/ede608961d4b726d3bab9806fa8c98b4/jevolevupuz.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/21160389187.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133716862d40---kulateludivifa.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/c949b09927410a52a56ac7ae0fff1a9f/97501444104.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210918165603.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_off0000d8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D1 10636 bytes
SHA-256: a77f9775fc0a4b5975014aca577f18ddd131b3c03cda4d119588a3f2ed6bbc45
font_01_sfnt_off0000f0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10911 17052 bytes
SHA-256: a8e8c50498b610cbf0dbb52e8e53d1a64eb805c36f762405ee5d28ac14f249ff

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