Malicious PDF — malware analysis report

Static analysis result for SHA-256 53772a0c6ac8507e…

MALICIOUS

PDF

116.6 KB Created: 2021-08-14 06:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7cd51a23430d0b1603a53cf8c9f05e6 SHA-1: 64b019fb2063c6ec61185b2811eaf663efc09905 SHA-256: 53772a0c6ac8507e1ca61648e3f89c87942e995df9907a60dcb310a8a84a49d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to potentially compromised websites, suggesting a link farm designed to distribute further malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of external URIs and link farm heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

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://przedszkolenisko.pl/userfiles/file/25933359851.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/1s79opp86jlfj6jq4h59q8vu17/rowovazapam.pdf
    • https://a2designbg.com/userfiles/file/fovomutefisumimigojuv.pdf
    • http://risme.vn/files/mojukagijesimirat.pdf
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/91286011507.pdf
    • http://househouse.it/userfiles/files/44756994049.pdf
    • https://cailux.lu/userfiles/files/xatilaw.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160945b8caa3ad---torokomigosu.pdf
    • http://cropscipublisher.com/files/upfiles/file/26095036317.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9f61ee04b---kopunimexolanete.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/19aa4705ca69049945e75a7ad223c56c/bimaxasumidakolewetixa.pdf
    • http://megaprestige.ru/uploads/files/tewimumaxerafegevodid.pdf
    • https://zzwgjx.com/d/files/togariradofo.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160836a2228338---513986594.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7488cb31df---modekitodelajapiliwafanid.pdf
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/60865562165.pdf
    • https://kfmaccounting.com/webroot/img/content/files/zoworesixafutigokudore.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8bc59bfb9b---litexebawefugedegirefa.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d8c15191f---7625903117.pdf
    • http://mosjob.ru/images/file/23437359251.pdf
    • http://duhochmis.com/files/uploaded/files/xokejez.pdf
    • http://global-insurance-broker.de/downloads/noleletibivexifamudi.pdf
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/2208465113.pdf
    • http://alimentosldm.com/userfiles/file/68001882754.pdf
    • http://goldnumber.info/userfiles/file/86785700531.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/6afc9d68634986a8614c5a177f1d7bef/nutus.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=healing+with+the+medicine+of+the+prophet+pdf+free+download
    • 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_off000160cf.bin
59edf02294804f6b4628ce8f901ecb926b43f83ef4608a304263c61d2b9cc2fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x160CF 18468 bytes
font_01_sfnt_off0001915a.bin
4c228ebbde962414f0ee1855b5e9cb520899e1f0ed217a42b3724da17768a6d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1915A 10976 bytes
font_02_sfnt_off0001aa5b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA5B 16792 bytes