Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b78e29a1cb784c…

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 08:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 851ea0a92b0eaa7018d55f4b22da84c3 SHA-1: c80f2b3bee7e11fefac54b3f19053477640e55da SHA-256: e5b78e29a1cb784cce7691ce67fd0ceb0e6b08c8f24cdea76873a978d2600b85
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload directories, likely intended to host and distribute further malicious content. The presence of external URIs and a link farm suggests an attempt to redirect users to malicious sites for downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/70910224018.pdf In PDF document text
    • https://kluchar.net/klucharnet/images/file/20978086907.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/tinodumixipopagusesareton.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/livumonigibabakugeva.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/6077f6fd00caec76367abd3c999bc9d3/63174055071.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/loziwuxaxiposerud.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/831548ab3d7c5560826fa7ad7a353a3a/29330438563.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/25228779500.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/jitesuloj.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ae62b5015---84581717874.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/52823403037.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/88110436751.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/sanokenusirugarali.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/qshrh3khti2pil41smocfjf1qf/bifolitulibax.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/gifakolonotip.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/xukej.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/24860311321.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/4eeeo82tkfsp2qjltv56js74b6/23132638480.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/32776251915.pdfIn PDF document text
    • http://demkapi.com/resimler/files/44110025556.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/puzibul.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/xinosemutamo.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210914004256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=sideload+apk+android+tvPDF 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_off0000e92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92A 17676 bytes
SHA-256: 9b72a10cec96040bf468283d9196cf13a2bc8280ef43f2377319f6c7724ab364
font_01_sfnt_off000116ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F06 10448 bytes
SHA-256: 527acce9ac5ba90b5b59aecb30fcfe09d8dd61a265c4fff0258d36a1916c37ee

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