Malicious PDF — malware analysis report

Static analysis result for SHA-256 392e053f1a1533a6…

MALICIOUS

PDF

80.3 KB Created: 2021-08-25 18:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 157dd52d91046e7bb5cc66c648e50e75 SHA-1: 685af17ee40b475b0d58f2d92bd28027bd1a7151 SHA-256: 392e053f1a1533a629f3d1e1e8666757eab59d54938d2f8bb6b4e9e249028831
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 WordPress upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://aodaibooking.com/FileData/ckfinder/files/20210820_09CE52F4E8975AD8.pdf In PDF document text
    • https://area5srl.it/file/wurodokulegorudinoba.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160febf7672643---satigevuduxurulebijizok.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/82007333757.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/fezoropufopijo.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/7971250f46defac1122059b55ee1beaa/58897102479.pdfIn PDF document text
    • http://peoriamayorprayerevent.com/clients/1/16/166e3f524b51ec168ebfd48f86188a1d/File/93572427752.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077a54028bb9---69907220315.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d230dd1a51---morasokipejaw.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/70742255867.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/95739123543.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/7784361654.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/90541645104.pdfIn PDF document text
    • http://eta-aus.org/userfiles/file/20210823162205.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/digimineg.pdfIn PDF document text
    • https://fond.ru/userfiles/file/polimunul.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e880f7a9684---fixasagenin.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/1be30091972342fa60184a045a957f03/25767047270.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160753f1f353ac---likob.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/7f8ac7fae2c4b1a449b17c72545d0643/moponusidoz.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/80761669589.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/lujinoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=rules+for+dividing+negative+and+positive+numbersPDF 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_off0000d632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD632 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE49 11192 bytes
SHA-256: f352b65c97165bd15ba6ad0466fc4d378d9b96aab310d20731b3aaae17606a44
font_02_sfnt_off0001080f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080F 16716 bytes
SHA-256: 9301a272318126af21f2d57ff7fdad04b2dc6b78a3071d5637e5504a2ba888a3