Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b5ae9c33852b00…

MALICIOUS

PDF

99.0 KB Created: 2021-09-03 22:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 38c1ca1ed4fc7ae00793efd5a11b92f2 SHA-1: 0dca03783bb1062bccd754ec0dee5e3c4e690cb5 SHA-256: 85b5ae9c33852b0027e61bb1c4c38d965b3b1c0fbc4a64ec603b65aef8126eb6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojanized PDF. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious files. The presence of external URIs and a 'download button' heuristic suggests a lure to download a second-stage payload. No scripts were extracted, but the overall structure and heuristics point to a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://daxitrip.com/basefile/daxitripcom/files/kibetofutixod.pdf In PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f666ffd5c33---gewuvirisavixawojimikewal.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c34d9cd1fb8---tibanan.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210624_26E999195114A1D2.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/sonin.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082649cbb55e---loludonapatetoxakubolaw.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/4f15868520bff1b2c2c48ffdc500836a/sevotemanomet.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607567b285ff9---ranuponakopuven.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607235355ab3b---fatugudujunozexozun.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072da9f996b1---66513581819.pdfIn PDF document text
    • http://abc-tel.ru/data/File/87858475348.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/vigagifibugiguwotuv.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/52710411602.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a486709b124---nivikuk.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2aa9598606---jagapukidopepiwekubomujiv.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/810ef5b62f59d06b9abc0578019d7b92/5163420122.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/lejudomalex.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/rabegojixururajukoze.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/wetokuk.pdfIn PDF document text
    • http://elitvorota.ru/f/file/zenurafijijire.pdfIn PDF document text
    • https://tmtteks.com/files/74483659521.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1100c7597---tugiwikifazukusesepiga.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/063fa054773ed9338ead6b52c05dc33c/67015104960.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dcc88532e---kutusavogogotu.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/pexugabilisiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=eckankar+ancient+wisdom+for+today+pdfPDF 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_off0001183b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13052 11008 bytes
SHA-256: ab23a1c3e40795f1b725632d541acc559d5a5f15b925ef134b19877d73d01c91
font_02_sfnt_off00014a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A05 20016 bytes
SHA-256: 3843bec930bc0598eebc0d40d12c0469992e0590baefdb1a7c18b09002637439