Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc79b9257fe8151c…

MALICIOUS

PDF

79.2 KB Created: 2021-07-04 06:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 153d6a11ae99d390e7a0b165796a4537 SHA-1: 1b4c55aad6c5a5f60149f675cdecc2c12304c95b SHA-256: bc79b9257fe8151caec9b7659c8df874a9d1c0f60d2252ff2f4c8265b2260e16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised domains, directing users to potentially malicious PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure designed to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/823bd4bee45fad2c10e656d368347e8a/nomefakupomorumos.pdf
    • http://doubles301.jp/files/ckeditor/files/vubukibiwit.pdf
    • https://audreyheselmans.com/_files/file/22685425816.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d863457cb1---44201101430.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/1e8aebaa3e7316e6ed7096e8f3e724c6/gagelopunufalokexawudeg.pdf
    • http://alimentosldm.com/userfiles/file/lumemidedakutatujolepun.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f51e43ff6---pawibep.pdf
    • http://forter.vn/hinhanh/file/32499023298.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608243832e25a---90356205833.pdf
    • https://retta-bg.com/userfiles/39850920338.pdf
    • https://parklanehotel.asia/userfiles/file/silalo.pdf
    • https://its-bulgaria.bg/files/file/rosulu.pdf
    • http://michardardillier.com/ckfinder/userfiles/files/68821326089.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/5032c7cf490edaf9a9467222fd081b6f/15594425892.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/mq2tpuj2us3lpg7qhan00htpgg/karalifuzuf.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/627fd9be73a9dd92b1f088bfae0eb926/tefejo.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a4db2f323---93608488820.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160948b627e905---96019771690.pdf
    • http://sunwisechem.com/Uploadfiles/files/46250915953.pdf
    • https://gachbinhduong.com/upload/file/kirogufawisupoxilole.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/3d42a94dea8591156d9e67a84f10e145/56900783803.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b896a6815bb---80480352283.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=john+c+maxwell+the+difference+maker+pdf
    • 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_off0000d35f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD35F 16792 bytes
font_01_sfnt_off0000eb71.bin
3fd5261c9c18adce3b921da5d73e191cea814f80f80e45e55746540162fde0cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB71 16500 bytes
font_02_sfnt_off000115f3.bin
b50e45534ce662db82f4e366e2575e98679b4d0a5d8941019a30ed015feda81c
pdf-font-stream PDF embedded font (sfnt) at offset 0x115F3 10988 bytes