Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa2cfe06bec181c3…

MALICIOUS

PDF

89.2 KB Created: 2021-07-29 09:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d0afbdc6ed4ec0037d2c3718425be25b SHA-1: 317f70516175685183c8ace5932fbb24131cc0b8 SHA-256: fa2cfe06bec181c352b76e60d43fd6a87093fc3777fafc451b88f6b61c39fb6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and disposable hosting being used. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing or trojan. The document likely serves as a lure to direct users to malicious websites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pistant.ru/uplcv?utm_term=how+to+apply+for+walmart+cashier+job PDF link annotation
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/72c5c16b90063fa1f37324c885caaef1/busawoginoruzug.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25e5ce8e68---22508440865.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f025b3109---19945940056.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/859c9952b47d6e5fc49fbf709b075a95/nonisu.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/87224350692.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1d2d0c726---99016466255.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708151c5aed---86558004730.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/nanibadawesitupevovitofo.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/gagasijalenowi.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/67014022000.pdfIn PDF document text
    • https://vieclambaohiem24h.com/upload/files/kofijatetidesubukafo.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0501b58f3---wudapumedigunefon.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/74583588423.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/bajuragufinalekesekete.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/16097253966.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607660c84c0d9---54082940199.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160aca4c757146---nejarolotitodu.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f78899478---7295278709.pdfIn PDF document text
    • http://slsnn.ru/content/file/mowujiragi.pdfIn PDF document text
    • http://mcutech.net/upload/2021/07/file/16264366781893626067.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e8de9e3eb---35658568516.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088e91be45ce---sobikikak.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/dljnmm4s3u7ek5nu0itfuna98p/xugiwa.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec7003b577---xafuruvuxugubavitavud.pdfIn PDF document text
    • 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_off0000f5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFC 17756 bytes
SHA-256: 0801e1e3c39a448129e31a17ec2c125ddc9b79d5b528dd5a98dff124e95e65bb
font_02_sfnt_off00013ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE1 11104 bytes
SHA-256: e7c7b29517ce9e9cdc58fb02704132d324cd290b621ab2ddd20549e86599ef67

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