Malicious PDF — malware analysis report

Static analysis result for SHA-256 513f3d6583b32405…

MALICIOUS

PDF

87.6 KB Created: 2021-09-17 22:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04e10053ea64786d39d0269a03374641 SHA-1: caa640baf8a2d48c4d128877b9f8cb9fcc0bc5b6 SHA-256: 513f3d6583b324052b6e3b3da48c6ad79707f72da88ada7f1ec4df5552e71225
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/95c1fe984828a296cc7a013d923dcfb7/popabunasaranawamosar.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/c51285c9390f7d2792976ccf687db5bb/56084333728.pdf
    • http://sswjeans.com/files/56235581316.pdf
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/13180109170.pdf
    • https://bepxuyenviet.com/upload/files/pasugewadukezipu.pdf
    • http://rimini-portal.de/bilderarchiv/file/navonotazemu.pdf
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/budagoz.pdf
    • https://myarchitect.es/ckfinder/userfiles/files/94222484480.pdf
    • https://ceccargiurgiu.ro/userfiles/file/39207007921.pdf
    • https://flyags.com/editorResources/file///24744833480.pdf
    • http://massintech.ru/img/outer/files/14454923717.pdf
    • https://dbjadow.pl/attachments/file/filedusenifipenepax.pdf
    • http://reedxtrainternational.com/uploads/pages/file/dotejezenutovuzotupalij.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/40e41b3fb52df1bd64c6d689752c42bf/vorix.pdf
    • http://fujiya-burbank.com/uploads/files/zopekuwegamubub.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/8c5b2ea37cd4ba8dbf9229ea3c5f3aca/22936494690.pdf
    • http://1yunnan.com/ckfinder/userfiles/files/79286917715.pdf
    • https://alpasol.e-giant.net/upload/files/wirelewuwiwulinedaxom.pdf
    • http://consorzio-csa.it/userfiles/files/kefuwiwovenakorebinewus.pdf
    • http://bachtungcompany.com/upload/files/60466393278.pdf
    • http://www.themixchange.com/userfiles/files/93951257.pdf
    • http://phamtrangia.com/upload/files/pomij.pdf
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/valerugodizekax.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+do+i+set+the+alarm+on+my+android+phone
    • 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_off0000f0cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CC 16792 bytes
font_01_sfnt_off000108e3.bin
079ef6291c6a702bc709d8ed5c5fb0d4c00e2661c04de8f447ce7f4e1b9195ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x108E3 10848 bytes
font_02_sfnt_off000121bf.bin
a20d2692592602b8a184f1276ef698d4c1e21e6049275ddc9704517370215442
pdf-font-stream PDF embedded font (sfnt) at offset 0x121BF 17992 bytes