Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9f7f02c2fe3adf…

MALICIOUS

PDF

79.4 KB Created: 2021-09-17 17:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee0957a64a149696a7ff280527d35ac4 SHA-1: 3533de0c4f2a06fffda8beebd4a57cb78c56b474 SHA-256: af9f7f02c2fe3adf514d01b760e8492f73e1239d75eb9bf92622cc175445d0d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=estimated+wattage+pc PDF link annotation
    • http://jinyezi.cn/upload/45425522307.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/zowotetorogorozifineteg.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/2892447486.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/woxisazukafabikakezenim.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/kavidiwogonibatozoxipus.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/19072988711.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614488de3e125---wedulejomupaboma.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/93117310285.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/negari.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/54513766863.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/nesuxajugepufizefaxevupob.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d0735ea26---51983833012.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/bc2d755a9472d2efc30bcac2559d71d7/sapefuku.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/fekevagafe.pdfIn PDF document text
    • http://unseretochter.ch/images/file/xutoxi.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-15/20210915161027653353.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1288280281614467a3c1f80.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/52087357436.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/28106070227.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/beputilu.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613654c040fcf---woxoti.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/piruzofiza.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/finimatabizavob.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/jqqrk73h1kdlrc18lv98nt90l0/gunefavidatetojupo.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_off0000d554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD554 16372 bytes
SHA-256: 6742902e5e0dcb5282c151954884955c202b6c97172f1311a9c470ab6f8078d3
font_01_sfnt_off0000ffd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117ED 10556 bytes
SHA-256: 5eb5fbfff1ef7ded0d53172d22c4c6d4dadc35a39dfe311a919455d14054367b

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