Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a84a6d708572c3…

MALICIOUS

PDF

75.9 KB Created: 2021-09-16 23:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ce4ec05a86087e314950515d66cc17bd SHA-1: 34401b8b28da7d6861def41bea12fa9b8cf2c36e SHA-256: 84a84a6d708572c31e69c28c5d5f3b9388de29dcb81add061489362f9277c8b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm with numerous URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious content. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142ad7bf3555---83631763807.pdf In PDF document text
    • https://flavio-tonon.it/public/file/4053980324.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/40849390349.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb816a21d5---vegamo.pdfIn PDF document text
    • https://camelcarpet.org/d/files/pokagexukavugisodusa.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/27450262434.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-8/20210908085455902985.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/51339875811.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/51683180856.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/42134042859.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/2b883678da7d6f0405a092bd5303fcee/dezafowoxodakolux.pdfIn PDF document text
    • https://revive.fashion/upload/files/zarexobedopizebuxez.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/wolotofoziji.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613c7f0c27504---31852198723.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/zafidukotej.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614277882fbf3---92291368008.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/mh4qp8app4ufhcdp3kbdmhsb5j/99695352067.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/nubikijonibep.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/kajebokujalawexap.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379cc367ba3---98964440828.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/laped.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/nobuvixawadogulekaxeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=need+for+speed+apk+offlinePDF 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_off0000c899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC899 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AB 16208 bytes
SHA-256: 1fe7353746d9697552cd30b5ba66361f24f0243ebc23d6c122ef05af9a8f9991
font_02_sfnt_off00010a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1F 10460 bytes
SHA-256: a5f2f558975dcdf721f7a9947f0ec896eeefac89335059df40557ca697c3fb7b