Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a64e34003dd355c…

MALICIOUS

PDF

87.8 KB Created: 2021-08-16 11:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ecbe55010c7361b8ca27076189bfc6ef SHA-1: aa3b995c969ab6850ff010dd91760bf1fe0c52d1 SHA-256: 2a64e34003dd355cb0283ed787f307010450a8b09efb5ee9f3591ebf5cb9e87d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to multiple compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The document body is unreadable, but the presence of numerous links to potentially malicious content is sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/6fbd83da547470e3e44ccf24cdbc092f/tajonedorozugezero.pdf
    • http://pokorny-podlahy.cz/UserFiles/File/54891836144.pdf
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54879091426.pdf
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/laturutose.pdf
    • http://feuerwehrobrigheim.de/upload/files/somedezojevuwadox.pdf
    • http://ventilatoryzlin.cz/images/file/76448804998.pdf
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ronazasemuni.pdf
    • http://arcomproltd.com/userfiles/file/bowugijuxisewewujesavobad.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/xenuzif.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/gkdf2uimn5b6hipgiktot97sv7/44888380333.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/6be8d7b78c6592d109610bc53a1a15bb/61095125395.pdf
    • https://kit-veron.my/ckfinder/userfiles/files/radomuxevonomufewefud.pdf
    • http://korea-seals.com/ckfinder/userfiles/files/16075756804.pdf
    • http://guides2alpes.fr/uploads/file/90748410402.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16072f4f16d3ad---27725871084.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfa1c93232---botiborusipefazovelodosaw.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dde96d8e85c---42189645341.pdf
    • http://stlukesmn.org/clients/17773/File/zulexixowupiwasafatimexos.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/0a6bd1962b5b768f786cef44df393af2/fuzidogonotirujewitu.pdf
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/fojedobeji.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/42e3d828c9a5912aba93ace42253e3d5/sepojaweko.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd86ea450ad---64543357887.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a01ed1ce09---fedevu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=pokemon+nds+rom+hacks+2018
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off000129f0.bin
8b1a0eeaf67522f5bde51a90145235420708876c48f8fe0cd7fe724e8556814b
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x129F0 21308 bytes
font_00_sfnt_off0000ce2f.bin
6f93328b27839d85c7f15022a80b9ac477af124e252657615dae06ce51e2ec1c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2F 16364 bytes
font_01_sfnt_off0000f86e.bin
2ac986217cd2c236674e6b966ced025af23caff0dad867c849c46bd3b2a2eb26
pdf-font-stream PDF embedded font (sfnt) at offset 0xF86E 10996 bytes
font_02_sfnt_off000111df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111DF 16792 bytes