Malicious PDF — malware analysis report

Static analysis result for SHA-256 422b66300b658001…

MALICIOUS

PDF

87.4 KB Created: 2021-08-07 02:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f861a64944e790c5d29006fd7c3f9acd SHA-1: 9b3c242b03a333cd95a5aaeb576ba42bc26ff9cb SHA-256: 422b66300b6580013b650a947432754adc5456313d8d9052d6697aaafe95e960
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an effort to obscure the ultimate destination. The embedded URLs and the nature of the heuristics strongly suggest the document's purpose is to redirect users to malicious 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 http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/ipqdumo1k653stsvsvuh6ru9a6/simivokopukidujuxanilemer.pdf In PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/lbtaslfhscipb3dgolpqr8hoff/bogesonepediguxari.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/34279413949.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/d1rgmt0em7jauhae5helbnms95/nokadegojeredutulefuri.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/59ep0gg456fusch2imoc2oivtq/balezon.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/xutopedekipunatudugumuw.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/b4017ebf3fb37c6c5479c24260d97c69/nuwixefamafuzasepuf.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/f8bc04faaa10b7e2e29667e0cf05382b/powutijaz.pdfIn PDF document text
    • http://khacdautron.com/Images_upload/files/marofebajaligejunopape.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/20d7f8f7ec84b9ffaf89dba11dbf658c/34377310105.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/34f99h5ns10o80egs3ppjj865b/rutefoxogojivu.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/47278407131.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085b95558707---powudexekiwuloxuwulivare.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5ef6ae137---42033513308.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/zufumazizafu.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/vtralpsv925tmtmnipfnrf6fk1/70313498019.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/078680797b7a970870a1a816f04cc5ea/sijaw.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/bopapeligesanarakirafug.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/rizotu.pdfIn PDF document text
    • https://waroproject.com/file/darola.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98a61c40e---bowunetulizusiwofigibiwe.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/53775268753.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a97d5b3f91---3336868390.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/wuvulisupejif.pdfIn PDF document text
    • http://kme-kme.cz/files/file/letafep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=girl+voice+changer+app+free+download+for+androidPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20A 10824 bytes
SHA-256: 6989933d1aebe6ef6ccb1208429ad8324d8f267d540d51d21fae8f1f12355858
font_01_sfnt_off00010ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D8 17024 bytes
SHA-256: 277457ef05d7bb061dc9c7948e6d70913c26ad8cf177f235b18a4296ead958dd