Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88a79d8fc6fae7b…

MALICIOUS

PDF

97.0 KB Created: 2021-09-08 08:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7e529090ba72109cb3b7224f1a09ac3e SHA-1: f3a8e78213a43f193b424cf2d9e71c85e24d849d SHA-256: b88a79d8fc6fae7b0ec8680c56a37e584726971cb616b2c9b1e5c6eb6317ac4d
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to compromised WordPress sites. The PDF contains numerous external URIs, suggesting it's designed to redirect users to potentially malicious content. The presence of multiple compromised CMS upload links and disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=the+billionaire%27s+game+ansela+corsino+pdf PDF link annotation
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/507832f041a14b81f3da71c0ab662814/43209198962.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/1ef18607ac41e7ae4218c90364ab64c3/kopon.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/15766825030.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/70016805688.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/62726368624.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/mubebesutatar.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/76589277491.pdfIn PDF document text
    • http://lakesideterracecondo.com/clients/41361/File/gazuzowopojoxobonef.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0b809d0ec---tezuwiwozutitubanizam.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/maduxokarekovagifej.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/dibazelubusoj.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/5j630jt4a950fohckd0mm73l6h/66147703421.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/laralexalifete.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/59904331552.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/15694168052.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/25276055969.pdfIn PDF document text
    • http://haileylusk.com/clients/e/e6/e6412a3df854040bfb282c4f37eddf02/File/xawuwekekadata.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/17129619806.pdfIn PDF document text
    • https://yz-yongzhong.com/upfiles/editor/files/85723874313.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/kanikotupefitusifuwifibaf.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/435773df10d14d251d8a6f71cb443dd8/43527982901.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/riwebapinuvapazemevevif.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160966b958344c---17128662602.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_off00011342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11342 11108 bytes
SHA-256: ef8d600c9dd5dd388b2069ef8c7472269b98f5421df89dbf8b984b23062f1165
font_01_sfnt_off00012c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001449d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1449D 19352 bytes
SHA-256: 798468a8c1d9428af5c3f8685aca43ab96b839a0e795675200afd0152db6be63

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