Malicious PDF — malware analysis report

Static analysis result for SHA-256 1938c5e3ae83013c…

MALICIOUS

PDF

68.7 KB Created: 2021-09-16 22:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9abd46b9aa86642263f0e2532aa5e2d2 SHA-1: a6418a2e7218e021989ef2d5795d4bb7dc2231e6 SHA-256: 1938c5e3ae83013c0b7aa5dcdd207928d1b5f8df4ff673f3025264f81c0a89c6
176 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure due to its small size and image-only content with an action trigger. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content or redirect users to a phishing site. The presence of multiple unknown URLs indicates a broad distribution or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b77f9de8f---fajetajewaweku.pdf In PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/73504730834.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/62569782795.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/a658053850e32f9ae77d7f030df32c7c/mowufoganosafarawilanupi.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/49954115425.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/29645738254.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/54104917054.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/4608708630.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/11087043343.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/didonowerenakexelatin.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/60839759440.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/15476076690.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135dcedb3f8b---47055445367.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/xazozomigagaxamimevip.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/japukanazisotuwo.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/30469321097.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/38c9ce44587b8ab45a384d72e8ef4a3c/tozutaza.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/gorebigejepazutusasonarig.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/lolasorutogixanekapa.pdfIn PDF document text
    • http://www.moyekolodin.com/files/febipelepejoli.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/95749761391.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/68121035928.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/rudalazubabozozekipepame.pdfIn PDF document text
    • http://byecook.com/ckupload/files/jalivamajobef.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/koxasagekimezutadopil.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/bubur.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/duwiligebuzomabotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=hexadecimal+to+numbersPDF 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_off0000b214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB214 10864 bytes
SHA-256: 907d9ca93899c649832a5352dce2b0b2f6f83f49112c762968a79141ce01820c
font_01_sfnt_off0000cb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB10 14036 bytes
SHA-256: 9f8cadedd71d9a92af1ea62e66c4c1788be8fdb732899e64ee7c153d65d98367
font_02_sfnt_off0000ed83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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