Malicious PDF — malware analysis report

Static analysis result for SHA-256 1013f4f98f494d7d…

MALICIOUS

PDF

114.1 KB Created: 2021-06-30 17:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 614cea3ea8da972f3cc3ed80c0c57642 SHA-1: 544bc3f1ffe80dfd0ac6d58e847f1807371b3507 SHA-256: 1013f4f98f494d7df377aa2a04fa54a9279c2058b0040d965cd2df50a4d1b6f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or manipulate search engine results. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://balogmihaly.hu/UserFiles/file/tudajef.pdf In PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/27b5184c24b0bd667ec0896e11505a9f/fuwosagaguve.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/gogevopejobozujobebajil.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/21412513851.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/tomez.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/vajitomoxitikizugukajub.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/35039225658.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160991d0365ed7---wixup.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/jusopijakulux.pdfIn PDF document text
    • http://centrons.com/uploaded/file/12654041060d2e0bfd4a9c.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/46c462d7dfe9a18d73373313dfc643e7/93357453959.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/677c31bc03009ff03062d99e2b3c87e0/84397272877.pdfIn PDF document text
    • https://banghenails.com/upload/file/65427793591.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942fff52bfd---42249815327.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021060318372063.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f936ced842---kopukoxivomazaxod.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/85177154559.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/tesamorugoko.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160d638e01b5f8---223353368.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/d9225bc6c7c0ea2ed4ed58f5b01a475a/16739781390.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c2f014823---27459453859.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/31678450095.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d005240de---37875691123.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/63257202359.pdfIn PDF document text
    • http://kudusde.org/resimler/files/mipifejasuxibi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=jamb+past+question+and+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14352 18020 bytes
SHA-256: cae39f2b0c2649db13bc1f3b2573f3a7308b70cf494bebb75d31536d786746f2
font_01_sfnt_off0001729b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1729B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AB2 10972 bytes
SHA-256: eaf5d4eb1302dcfce96145cf03def4d929e0b5aeb840dc9add1d94e4462590a3
font_03_sfnt_off0001a3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3BE 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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