Malicious PDF — malware analysis report

Static analysis result for SHA-256 07f94142dc9f82e2…

MALICIOUS

PDF

78.1 KB Created: 2021-09-15 21:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 013e69a08689bc9354faec4ddb5f56ba SHA-1: 12919bbf7166d3a0fed5e02e684d618230034926 SHA-256: 07f94142dc9f82e2449ed863220735d11488ebb62deb85f0a5b868f0342d5d1f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to files on compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://castudio.eu/userfiles/files/xebupalirejozituxufu.pdf
    • http://nb-magnet.com/upload/files/72459068754.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/7v4ci01i02e3pgiruioddf4c22/pidebiralifesomovoked.pdf
    • http://heaig.org/editor/ckfinder/userfiles/files/2656704183.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/0eb1af562128a69f5d390edc3c69e579/39797275532.pdf
    • https://stvorki.ru/files/file/jivupurepaxoxedolevujiram.pdf
    • https://netlandschool.cl/files/xijowilapigipo.pdf
    • http://absolutelyneon.com/userfiles/file/xitudadu.pdf
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/72569132194.pdf
    • http://khiensa.com/UserFiles/File/7348637398.pdf
    • https://rivieresoceanie.com/ckfinder/userfiles/files/51683693098.pdf
    • http://lachina.cn/upload/file/nejibubab.pdf
    • http://pure-chiral.com/upload/files/8001804348.pdf
    • https://devcons.org/uploads/userfiles/files/kutipolerowopobezen.pdf
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/56274987186.pdf
    • https://armenia4d.com/contents/files/jexopotefugiko.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137088189537---1915737637.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2bf57afb9---duzubuzozexesabazakinij.pdf
    • http://tulga.ru/editor/files/janadutidoxokikirakarofif.pdf
    • http://automsystem.com/UploadFile/file/20210903004920038.pdf
    • http://linpus.com/app/webroot/userfiles/files/44977613699.pdf
    • http://weighlessthisyear.com/ckfinder/userfiles/files/digufamokigakuko.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bdb95882d---mizabimemotipu.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/b26d144ee2f36d5270e859d3a146043f/mefufanobiwafana.pdf
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95392238922.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=free+fire+survival+battleground+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc95.bin
b19f3926006279727811ed0158c3b40f2b5185cd1894316ed282dd7b7e996505
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC95 11048 bytes
font_01_sfnt_off0000e602.bin
80757fc1050d61629aac0ceefb6435ce10226e4b9a96a745b7aea32ace297e12
pdf-font-stream PDF embedded font (sfnt) at offset 0xE602 17196 bytes
font_02_sfnt_off00011228.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11228 16792 bytes