Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a80bfc1c3d1ca3…

MALICIOUS

PDF

84.7 KB Created: 2021-07-06 01:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e19364d97f18fd32af58a5efc3a75e39 SHA-1: 86da14c48c5b0106bd5b6ba05b5d64a52778a71f SHA-256: 13a80bfc1c3d1ca372245db2d84114d733e9e484f7862a80bb0fcfa4a93b67a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, likely serving as a link farm to redirect users to malicious destinations. The presence of embedded URLs and the nature of the heuristics suggest an attempt to direct users to phishing or malware-hosting sites, aligning with T1566.001 (Spearphishing Attachment). No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://synerhu.ru/uplcv?utm_term=chopped+green+chillies PDF link annotation
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/573270b496a8786069233d2902294fef/xidilade.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71a1bd44a5---19761107047.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/4721b227cf46ae91035aa6f1ce076667/34593707793.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/ae96eaf37c8bf013c7b5a8dae18a188c/11187368506.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/dd3abf237bbcfdf66d7097cdf64583b8/jamudajubutibo.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/34790542990.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/tifarepokokugugivutodege.pdfIn PDF document text
    • http://christopherdallo.com/file/judagamamefupigu.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/5glhssjb7r10mqdadq9ut58fd1/lofamaviriramoledomopo.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/247747762520b7c134fa7a242621312a/givawavobezon.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/zofelukewolikizifagu.pdfIn PDF document text
    • http://2440027.ru/upload/file/jaletosu.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/37651601339.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/filaxi.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/740624908.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/joledi.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/patotoxopimafuwe.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/kkipfaqklc4d2pukhcv1vjvqn0/vakubogafipemedafidodoso.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609063085d3cb---91644567273.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/zagijolawirelalete.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/180d79b4b497fe6c8480ac74fe08c956/bovebipavekopowotavulubaf.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/lirasin.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d78f3bdf0ac---kovesuradojuwunekepixovi.pdfIn PDF document text
    • https://agermag.ro/mm/file/20568990242.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C8 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_01_sfnt_off0000e6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE5 17748 bytes
SHA-256: 116b99db461378f65c61b43fea5d0dc91aae2f1342c52c3084af8920d86e91e0
font_03_sfnt_off00012d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6B 10564 bytes
SHA-256: 6a998c32371379b590dc6c0260f906446b91388677ef5fe892b95200bed1116d

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