Malicious PDF — malware analysis report

Static analysis result for SHA-256 a529d67c2e5829b1…

MALICIOUS

PDF

73.2 KB Created: 2021-08-12 08:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5d421fdf4ad74ce57a48e6a0d6ce8437 SHA-1: 2f2e1244d17b13438c1317ccb853c0ed6fe243b9 SHA-256: a529d67c2e5829b14599119bc9055e141b5724885f38aa95120e95a18d3d1995
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress installations and disposable hosting, forming a link farm. One notable URL is http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778a5614179---dovaxorukulufunaxik.pdf, which is flagged as a random URL link. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a vehicle for the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://ivankotov.ru/img/lib/file/63953460888.pdf In PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c696d337753---47643240255.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/15826289404.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/dukewowukixozibitodenolo.pdfIn PDF document text
    • http://prosquash.by/data/zasipafiwojuku.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/64413605590.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/88673916075.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778a5614179---dovaxorukulufunaxik.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/ck0d12ocfcdhujane2huh7bvl6/paxolukoridetik.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/62468372381.pdfIn PDF document text
    • https://nadamasristorante.it/file/97386546887.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/46015322665.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ar4ln08ch8483v7lvr3mp9tea4/4833449193.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/tegegiruwoxivunitafajive.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/61785430961.pdfIn PDF document text
    • http://01host.ru/userfiles/files/xafupemikekos.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/zawajoxifijoka.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f755d64a3a---zetatazetigisaxazevig.pdfIn PDF document text
    • http://puppiesjust4u.com/clients/c/c8/c8a8d0e690f73854b1e7a5fbb9521f82/File/jatuwafuworovifaw.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/31efd8c676332fba58bbe8ca447a3e55/doluxofujovezumogaxomus.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/52144150841.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff94f2e14f---97814078262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=minecraft+pe+star+wars+mod+download+ipadPDF 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_off0000bd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4F 15460 bytes
SHA-256: 29b46f270d2ebbdb047e4fe653ceb46fd7705ce420aca5b674e0bb40de663866
font_01_sfnt_off0000e51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD33 10860 bytes
SHA-256: 87e37d747ed12850c27f4108cf62dff2e0db7b54ccf0fde8027b0d78c6287307

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