Malicious PDF — malware analysis report

Static analysis result for SHA-256 950bc0c3fd89ba15…

MALICIOUS

PDF

69.9 KB Created: 2021-09-28 15:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 70f2952fb3efe101e30dc73c9cf14335 SHA-1: 755734ddb457d93b576b189329c83d206718d6ff SHA-256: 950bc0c3fd89ba1537b5d558bff6e49ca2160d886400d3e8be0837fa02a93455
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure with an image-only design and clickable action triggers. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS uploads, suggesting an attempt to distribute or redirect users to malicious sites. No scripts were extracted, but the structure and heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://clinicaveterinariamontecchia.com/userfiles/files/18034879596.pdf In PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/lotif.pdfIn PDF document text
    • http://langmypham.com/luutru/files/91888269721.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/85409291419.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/60982945449.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/sudageduxenemawoxogunixak.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/61917480030.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/xuvonidusemobeg.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/51973104331.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/94172806745.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/lizajise.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/sajeliboxebudobawo.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dd3c68d88f---senexekamulizufaka.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/32610110970.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/semokigifep.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/jodewirasamarusuvage.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/pidakatuparagixu.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615244739d0cd---lakagapaz.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/38132430779.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/43327483612.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161422687e7f7c---susotefefezigupiji.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/dimudatutadijeso.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/70428148167.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/tugulojurafupujamusal.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/84150585784.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+put+a+live+photo+on+your+lock+screenPDF 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_off0000b2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D4 10920 bytes
SHA-256: a17f5794623bdfcdc33b23c594d3c7c97dd49fd5a8e709dbd70666d690362680
font_01_sfnt_off0000cc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC20 14164 bytes
SHA-256: 4fa475946d16e413d6e466de1fd1429a9e98aa1e99b5f5382ee96b093d27d24f
font_02_sfnt_off0000ef5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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