Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c82dcccb7346ebe…

MALICIOUS

PDF

79.6 KB Created: 2021-07-05 21:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1fa1444d03b6871a697efae12e22cfb9 SHA-1: 3c1255660df007072e7001af7f57ddbfb915ff3b SHA-256: 0c82dcccb7346ebe3d842a4ad924ee5d6cb6905b538fbf1137c93f379d4af0b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the heuristic findings and URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://inwebjor.ru/uplcv?utm_term=perfect+pulse+rate PDF link annotation
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cacbf67f88---75811576554.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160deb628c25d6---kijujibuluf.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b461bedb2---11552028529.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5fd52fd79---pituveb.pdfIn PDF document text
    • http://jarosi.hu/files/file/77940652241.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f423d70920---vozanuzax.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/166e04614829e4bcae6d7a4c224b360e/kebazakeda.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/nubupopagopijedibe.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926e6182348---luzisovokodak.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870d9145a27---bomarunefirubelu.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ca2334485---polofikarilexamobipog.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/3e2ebd8a311d0c6d2a97f522a5378930/fubawes.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/22664450352.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/mavinowalosaxuvizi.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/fce1ea71f323a3d9cb1988edbd619b17/54125172666.pdfIn PDF document text
    • http://lhjmfamily.com/clients/5/5d/5d8645f74963a96e1aea25f3b610eff6/File/19495544471.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/xegaletazujifovijavotu.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/2d5c0f53c3fee2ce328623b503bac4d8/zukagipokuvalozozatufebeb.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/33404109362.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/pudowevinivakevoxit.pdfIn PDF document text
    • http://tencanpowder.com/d/files/bosokodigimibamov.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b58aa3b9b626884d614063daf40ad598/fetukaji.pdfIn PDF document text
    • http://cy2hand.com/userfiles/34189818512.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/metaloba.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/nawonejevagibekasolovi.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/28825b0ab847eb7ada096c53274ef993/bogodofolikisexa.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_off0000d772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD772 10256 bytes
SHA-256: 6a4562824f7c0bab646cade38c4fed4f36ffd49ba16dfd7870b1ee8bf818d7bc
font_01_sfnt_off0000eeb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C7 16416 bytes
SHA-256: 30e92d0c50bec3460db405b69783e27f692b4a2a2e46a402ea250ec2bf518794

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