Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa43cd1ae5ff2d21…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 15:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 46873817c3e10ba32f1fd13f2517cf0e SHA-1: f62904270e24988247ab9540ca56d4c0c10b3828 SHA-256: aa43cd1ae5ff2d2188dba1d3cae9ef282ce9ed2bbdb4b63e7e3e838e4a8e3d69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crysiq.ru/uplcv?utm_term=square+root+of+1000+by+long+division+method PDF link annotation
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/d3b3196b19c9fd4f7d3890d379954dfb/kegitexaxelukeg.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831d4a242d0---87100040251.pdfIn PDF document text
    • https://dm288.com/slicice/file/suwagasenu.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/38351822199.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/47758146290.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/fisosevimomaboxaseg.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/abt55itbshu3s8p91htj5p1pr0/64573479450.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3d10dec83---98947915580.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/nanigigegigelapinunagel.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/digagolulozobilokux.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/44vn9j72h5b5teugr175lkrlba/gexupuxitovixijeviw.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81ed5a0de---78846752041.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4044b95f8---61018409987.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/77470366146.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/98541219228.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/0a60945e94647af0badeaa1ed3075bb6/gidem.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1a7480e0e---84464601591.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/ad4a4609e99885f7fd72a1fce63bfd8b/84749071029.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/17708915781.pdfIn PDF document text
    • https://btegypt.comfile/76109882481.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cfa44fd1a---fobem.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e6b9682c0---16166683429.pdfIn PDF document text
    • https://777mto.com/contents//files/66294312638.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_off0000d9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BE 11616 bytes
SHA-256: c78bc6ee504d1bb52ad44e487e0e74c560a398ab8b62a2d385e7a93845b25783
font_01_sfnt_off0000f4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B3 18048 bytes
SHA-256: fac925c8f013ce46a5e59bbd3fd748000d0d7e98bbfcfd4bbb836af65aeadfb2
font_02_sfnt_off00012357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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