Malicious PDF — malware analysis report

Static analysis result for SHA-256 e141bb827fd39f4b…

MALICIOUS

PDF

99.9 KB Created: 2021-06-29 23:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a5ad26e56129c348657a45654f17e641 SHA-1: 02974b3a8b8bafd0204bec1238b00df157b3b733 SHA-256: e141bb827fd39f4b0b5b84732b35b3ac30c08babd0db5a4597305a9338ee6f13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5f5a3f066---7488989983.pdf In PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/8797856491.pdfIn PDF document text
    • http://abnicum.com/files/file/34171816735.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16086941f01e76---84360649185.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/8s4bb7l6s6233v3dvs3kq3fndg/mumirojobanemumanolufur.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a518fa8d815---pegifutaturepemuzelas.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/50726447773.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45f79b47c7---xidajutuwulasetobeb.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/acdfd1c13011af9e8129b1b8964504ef/zizirek.pdfIn PDF document text
    • http://nineslash.com/user_file/file/vamemefamib.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/59658404873.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/3l33quhs7bt0pcuh2j94b1srjb/48108193356.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/nudoboziribaretarelaje.pdfIn PDF document text
    • http://hncastlecable.com/d/files/10498283928.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a56545a92c8---61343961457.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/826492eb66c1604464b8274df1e116ea/birazunabusuzakidawanisu.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/59270234627.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/werubirubeliweda.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/ruvonuzefefetu.pdfIn PDF document text
    • http://ecologie-energie.com/userfiles/file/94808828554.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/98500688775.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/zanebekoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=anglophone+world+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000163f5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x163F5 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000ee1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1E 10640 bytes
SHA-256: 5625ac0f4167a7019112fc6ca6b0bb2e5bb89dfdaf80a18b2ba35cf171a5f5b7
font_01_sfnt_off00010613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E20 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_03_sfnt_off00012b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9B 22800 bytes
SHA-256: c74aa4c34569ac0c417cdce7c444ba25a74dabd83518ed6237741ad5b003123d

Open this report in the interactive analyzer, or submit your own file for analysis.