Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5917f6a93cbf4f…

MALICIOUS

PDF

85.0 KB Created: 2021-08-16 03:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6ffa9609629941b482cf3f5951d6243a SHA-1: bcf5284e394d5293f957bf1b0ec326e14c0d0e9e SHA-256: 8f5917f6a93cbf4f4e448aea71888ae9b33a3b0759751772689c597b22d01395
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious or compromised sites. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/678bdd8f6d4b0019ae9a7143ac0ad57c/pixorefis.pdf In PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c617224c75b---84520439073.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/33373100159.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/37148846541.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/2coihno5g45vc1qs3ema14q0m9/tujamumofejerokiwa.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e9a2dc161---pusaxa.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/41751184667.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608af5bea6a8c---45554461067.pdfIn PDF document text
    • https://izometal.net/mm/file/leluxas.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/gilozalib.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/pejapinuxoxozaxolejan.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/34080743812.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/nudul.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/66e1a2badfebea6fedfea74191a23efa/69546543510.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/76375258612.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074813e55026---gewobirinunevexe.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/85637084738.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724e8f2dc54---82479251270.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/renuvuzibidikejakome.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/7o9taiscsjavnfbsi5l66qtcf3/janazedowogenofepe.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/29337959423.pdfIn PDF document text
    • http://webbuilders.com/files/file/xopimafavek.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/16640872723.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/rso5cmvlqpqj6f9vvad22494t6/nasipalide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=algebra+y+trigonometria+con+geometria+analitica+leithold+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_off0000e099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE099 19264 bytes
SHA-256: 191ea7d7f7cdbcf91037bdabf77404071945bea15805a47f5c9123bd5529186c
font_01_sfnt_off00011129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12940 11136 bytes
SHA-256: 64a22c01ce46b9b40eb8d091f37fcd59987fc1f8ffb9cfe6baf0e2ef7d269603

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