Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c6add385253a6a…

MALICIOUS

PDF

77.4 KB Created: 2021-09-20 17:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 33ccfa8e9c6ab61c84ac3424a0b4c171 SHA-1: 90293d7638c9747695e8cbe87ecad9f4a971d184 SHA-256: d2c6add385253a6a44a0aa9ac971788b88f939ca8995cf23fc3ac56ec99f2389
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, suggesting a link farm designed to lure users to malicious sites. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score further support a malicious intent, likely for phishing or distributing further malware. The presence of external URI links and link farm heuristics indicates a pattern of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://laborke.ru/uplcv?utm_term=gta+vice+city+stories+psp+rom PDF link annotation
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1630874874.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/90403629914.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/rirufivuxinani.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16141680945d43---zitimukikilupamekasixul.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/81571099630.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/ledopuzesefalixolo.pdfIn PDF document text
    • https://btegypt.com/file/kusuzugovopuxutipugivowi.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/kafajemilejuvezov.pdfIn PDF document text
    • https://nistd.in/userfiles/file/21696981687.pdfIn PDF document text
    • http://forti.in/userfiles/file/mowavenanujawufigaxatip.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/zafexusexiwazodexugofe.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/14452517269.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/nujibefoxajoledojadix.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138c80f9351b---xotetu.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/39889718960.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614047547fbe5---zijopamizebilefubimulalax.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/dda9d10192177bc7043aef2c3bbcd8e4/mafalajujawejilowali.pdfIn PDF document text
    • http://info56.ru/userfiles/file/36409305564.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/kijerufaku.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210913175733.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/vufufali.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/genizelufirewodunarobeni.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/77570861702.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_off0000c79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB2 10604 bytes
SHA-256: ce3e0f7e0b3c8649ada2ea35efeff9a024991df882620d7cabb735ef2c2705f8
font_02_sfnt_off0000f80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80E 18740 bytes
SHA-256: 9fa66b997aec2fa5cd699b3b2dbab7460b504130d333503244e76c17e6970209

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