Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0605384ff808949…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 06:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e247d8c46c015b0b89d6d13415c05c5f SHA-1: 8a2f7fa5f79b9ee530858e31ad81f1a56c4c9689 SHA-256: a0605384ff808949ee5581d9ce8fcc436051b504f1421ec05e8757b0650cdcff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating a strong likelihood of redirection to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan. No scripts were extracted, but the document structure and embedded URLs suggest an attempt to lure users to compromised or disposable hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=rapunzel+tangled+drawing PDF link annotation
    • https://bloomland.com/sites/bloomland.com/files/tosuverudukofoduliduz.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/zavivosijar.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/31044253647.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/madezigixidofusul.pdfIn PDF document text
    • http://araonline.hu/uploads/file/nuzorekurovozugofowa.pdfIn PDF document text
    • http://nctpa.biz/clients/5/51/51e593b678cc4707ea5ff7b662bcbdb9/File/24548066495.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16120c47a42858---26707006822.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/a89d0289a46fe4f6ef63afbcfeea58d1/duretuw.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/kazidafufalutuguxidotibe.pdfIn PDF document text
    • https://signika.pl/Upload/file/62795528714.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba8b463dd4---32781985009.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed429ce24f---55164119233.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/mavoraravololuxipi.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///poduzozogopajudidipukizom.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/luzanadabimuxodomekekenu.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/vugolofu.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/dalagiwajo.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/9bk0pr2bd6g8t8e10dchvd5u63/xeviseforub.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/e86d0ce4e06abced57a6f4c7392aea6d/40824321444.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12b2ece59b---77233595188.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73ba178210---98887104883.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/tuzazozotobufogub.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/jiwiguvewuxosavufemobona.pdfIn PDF document text
    • http://novichiha.ru/pic/file/50363240778.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79cd27ff99---ruxewagus.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_off0000e168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE168 10572 bytes
SHA-256: 2c265106a0324041c5c9fc214627bc7acd3dce8bb5972d4b45fca6b8f0081511
font_01_sfnt_off0000f97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97C 17544 bytes
SHA-256: b67cb36a7725f5044b279edf9fd55ab30a6e52cde19ab7dbfa571a79664fcc02
font_02_sfnt_off0001271e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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