Malicious PDF — malware analysis report

Static analysis result for SHA-256 b536b3f3a7f31e56…

MALICIOUS

PDF

98.2 KB Created: 2021-06-27 13:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 65307de7c039473b14ca203e93c8471c SHA-1: ff661191052b62ed86ea901e7a6a1402134a34a5 SHA-256: b536b3f3a7f31e567a54a2a9a70a03c0a054276cdf4b2a6612d0f735bf20985d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple distinct hosts, some of which appear to be compromised WordPress upload storage. The primary intent appears to be to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9839

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 http://robwalker.net/fckupload/file/48989191398.pdf In PDF document text
    • http://staceyasp.com/UserFiles/file/75144472198.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d65fa48f7d3---57431376330.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608adc54a3b10---8128200635.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/39161395472.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/porigel.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/19ada0f753aac64b3449709ab3d6484d/27583457087.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/16d98b03003d8d2b0ea676d5f4b5e524/3456547054.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/4sjlorj5phi5o7641q6018h0fp/98896968758.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7ac54b73---bebegibapavisowot.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8a2205737---17826683166.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0cc05e9ad---kenan.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e7656cdfd---vijobogagugoded.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa5d4260aa---55216287.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/wibuzamimedefu.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/mulimotosanadaguvokunajab.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/41221192208.pdfIn PDF document text
    • http://com123.vn/uploads/file/74858210112.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/8c040ddbda66c78349dc5b6089a9c0ab/donuvijaw.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160887bae67d9b---meloga.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/8243e82e55507b1d5f983fca95496740/mufetixubaxol.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/25703192108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=on+my+behalf+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00011edb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11EDB 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000e5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E2 23728 bytes
SHA-256: 43965d397e60a690ef0d410b03999ea68465b623ba14c3b62d876e533f0ba9c7
font_02_sfnt_off00013c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15489 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_04_sfnt_off00016209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16209 10456 bytes
SHA-256: 189d7fac216992e34622eef9c3c428eef378e496943a92576b8f1f5b985deea8

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