Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fba938822714c21…

MALICIOUS

PDF

93.5 KB Created: 2021-08-29 01:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: fee9a820986e0015c07b0d0c2cc9588c SHA-1: c0ea84e83b0858a633212973ae20f461f897ddcf SHA-256: 7fba938822714c21b178ff090aac9eb4ef4bdb40d8821083aa9587ec106680b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve as lures to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://maility.pl_adresuserfiles/file/22942250707.pdf In PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/d49937aa360e284faa379b7e693de045/devojazejotidano.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a0d33d72181e7fa637cb3fe25aea1d02/nakawifivarixeruxigiv.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/pibelotivubipexepusazu.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dc259a726---tevuwisumopof.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b11f4d41938---vabewofaxem.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952a080b989---nusotof.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/danega.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/70637065861.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/76501169679.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/c4r3i6vr8iplmku8jj67tukmdg/salomokedug.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a39f86858f---64009765664.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/9f0e9083e96c7029bfcf57a0db490c21/22723321225.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/45414070197.pdfIn PDF document text
    • http://medica-brno.com/files/lujaforaliw.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/wudefusuwitomexa.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/0n0e5danrids3p90nqbelp2m3c/83515749171.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c438fa51aed---munejuxokiruletawaxiwob.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/3160ee870e33a084d9d2a688dcc451b9/romewetekikuril.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/davopaw.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65c4f68b21---lamuxewexonumajof.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/75d90b5ff3a463923e123e025ea6d418/63946053389.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/laradexoxodoparuluvidum.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/pomiridedekefajog.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf6e56302---10377239875.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d04b48e5c5e---letaxapepitafix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=what+does+com+stand+forPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001092e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12145 10596 bytes
SHA-256: 81023bb5e21c9ee23c3595b861f08ac907ea3add095c8dd6b9792509b6373e5a
font_02_sfnt_off0001394f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394F 18136 bytes
SHA-256: b9b95f9ade00831856da04a25bfa1dc9badbf7fb0ca58ab2342615f37e94c50d