Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a372bd8a62adc98…

MALICIOUS

PDF

73.2 KB Created: 2021-09-01 17:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a0788a6ead438ef02be68eda71d01d61 SHA-1: bc4a8a54ca9e86d6597d9f8dcfa7063250511320 SHA-256: 7a372bd8a62adc98fe2d0ceb334f668b54cd2fb27f93722d6f7cdd21889cc48c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bachova-terapia.sk/images/file/17725288307.pdf In PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d995cce00---puwonilex.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/5o44dn7geq45151o50k3qq1dqr/keninadokevijokuzaguma.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/76985815280.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/zidejozamasitiwijifozek.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/15838352766114af799eb44.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad708bdfcfb---somaxaf.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607feb25f12bb---nejejinuxufakegurikafuw.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/48354752965.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/rivitefakeruwitafumuboxu.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d26fdd34b23b16e784219c961851cf66/91945614724.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121a1b7548da---xolamamimum.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/3183431212.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/32599777475.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/67238073995.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/31782577272.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/nivavemexoxagil.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/63209255457.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/15501353410.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adbbf6837ac---70568453760.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/rezerinazaxiworosuvoves.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16073d677b985a---5261592269.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/9d2e65049d13c051800ed60fed19a1b2/rivizijimiduvavit.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/jegowolisul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=number+sequences+with+answersPDF 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_off0000bce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE9 16228 bytes
SHA-256: f0036573ee2d2e3c6acb43ccd5b6d2df9b4154383bf3b4b774cefd67bd507a45
font_01_sfnt_off0000e5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F0 10776 bytes
SHA-256: ad391ba35451b207dfc70c18306a0590bbb664610d8040a2b9c4e0b131c2b445
font_02_sfnt_off0000fea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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