Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a416d8a6c9e6a2b…

MALICIOUS

PDF

69.9 KB Created: 2021-09-02 13:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: bb1aea9dd86df47603c77ad7dcd0ca02 SHA-1: a9b56c40faefb439c77c08d215d55d6ac13d090e SHA-256: 0a416d8a6c9e6a2b4e5053d8a100d321a673cd3d0c4b8855f3546c89359bde5a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains an image-only interface with embedded links, suggesting an attempt to redirect users to malicious sites. The presence of numerous links, many hosted on compromised CMS uploads, indicates a link farm designed to obscure the final destination and evade detection. No scripts were extracted, but the overall structure points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 69 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 https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/976e43f3104e6ae14e76c20325608449/80236377201.pdf In PDF document text
    • http://oreade-breche.fr/userfiles/file/miligam.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/mosilagubulidixa.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/loos7dsuimlbmk359moo80donr/69227596091.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1f690e777---tawugekeseledemexefu.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-1/20210901161619165597.pdfIn PDF document text
    • http://canadanur.com/resimler/files/79081750326.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/90637342892.pdfIn PDF document text
    • http://contextuae.com/resimler/files/79223413587.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/nesuso.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tapamurekure.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/66172832528.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/poxokaxotabewawesev.pdfIn PDF document text
    • http://garderoba.sk/images/_file/binesobavamafize.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbc039e6270---woposufavisajiwimim.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/45411183750.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/jalugegufetujudukomen.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210507143125_1593142975.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdde809d9c0---23752367805.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c63f2f10f---83794724585.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a45acc15071---52189558102.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/tedunapofalomajutipudo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=counterparty+credit+risk+and+credit+value+adjustment+gregory+pdfPDF 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_off0000b2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C5 14236 bytes
SHA-256: 01b9257f885358116c15d3d5a014a900e6520d63c540438d52b9931413570886
font_01_sfnt_off0000d642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD642 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE59 11496 bytes
SHA-256: a2bf78be5a895505a6bdbdad3b2be09f5049bb77f6b98ebeb12206e3f74813cd