Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a20921dbf31611…

MALICIOUS

PDF

71.7 KB Created: 2021-10-01 05:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 707fe9a19d28cbb8c00c8b07e2c45d7e SHA-1: 0ccf0cb10bcb28066315535ed3b03622fb01fe64 SHA-256: f4a20921dbf316112c7592712f829cbe1dfcc178248ff93d67c749b02432e692
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external PDFs hosted on compromised WordPress sites and other disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the links indicate an attempt to lead the user to download further malicious files, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://irlanc.ru/uplcv?utm_term=download+apk+for+minecraft PDF link annotation
    • https://sherwoodchamber.org/ckfinder/userfiles/files/zejijusifavamazo.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/77299635162.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/88198515138.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/77469367288.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/2419a893a864a956c5c35e74eaf62518/41462283830.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/kewabebe.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/filedabanofebugabuvekix.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/44618536762.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/lutazowuti.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/64225481347.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/gisumirubigajutategon.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/eee3c50191dd421c05fdab8fb73bd462/zepuxogogapuxegiziwe.pdfIn PDF document text
    • https://mikludava.lt/images/files/jorenaparofuperijimode.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/96342ac33f723f3269f685415a3b52f3/27190963525.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/gubuzamozoxusigawemofebu.pdfIn PDF document text
    • https://mauspro.net/upload/files/pazabaloxafakaba.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/bolem.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zexibofasuja.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/lutitakutem.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/16427565406.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/bijeputuzaletaxu.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/99714848767.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_off0000b278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB278 17948 bytes
SHA-256: 8dabd6ec667e9493a4c0437d97bd3398a397eafa58490886af0b506d489f670d
font_01_sfnt_off0000e020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE020 10792 bytes
SHA-256: 9d9bb2d200984574729cef7834b3b67fdc8e5101b5805f7ed16bbdaeb553398a
font_02_sfnt_off0000f8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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