Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9bdc86bc1a148a1…

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 22:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: face659c5af582a1e0cdd6ab51f950a6 SHA-1: fb2b948ecfc0931139532f262b9b08cb38b0add8 SHA-256: f9bdc86bc1a148a1370fe7a1a9447690da85c708f0ea358e74afaecfee277a71
196 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm for malicious purposes. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and compromised CMS upload links points to an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=bugjaeger+unlock+bootloader
    • https://sluganarodu.org/userfiles/files/32455384729.pdf
    • http://thaifilmind.com/UserFiles/file/watoditarenamovexetivawo.pdf
    • http://wannawwannie.pl/userfiles/file/28610053989.pdf
    • http://feuerwehr-mittenwalde.de/mediathek/files/50845759728.pdf
    • http://acutecardio.ru/sadm_files/vumupanuwigijikobu.pdf
    • https://pjkconstruction.ca/images/file/vulakekovima.pdf
    • http://ascensionchina.com/userfiles/file/7355330036.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143f9b536e76---50738930190.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/68075c5fd3a9b3f1b7f26a845dff2ee9/wizejebexixe.pdf
    • https://cantellodetersiviprofessionali.it/uploads/file/dodofusutafiw.pdf
    • http://marikitaberbagi.com/userfiles/file/98412992638.pdf
    • http://alessandrobelleseveterinario.eu/userfiles/files/87655452735.pdf
    • http://jonellchem.com/upload/files/gewodi.pdf
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/modulozer.pdf
    • http://satakantaresort.com/user_img/files/61408568250.pdf
    • http://botaierpharm.com/upload/files/85036054796.pdf
    • https://podiummagazinenews.com/ckfinder/userfiles/files/96419801427.pdf
    • https://gamepinleri.net/calisma2/files/uploads/mekukivasifusosija.pdf
    • http://valencia.thepokeluau.com/uploads/files/guwuzararewizu.pdf
    • http://kantipursecurity.com/userfiles/file/togevuxepawamufog.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/3fe5a6abe58f9db74db047c03ee604da/87669711137.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161397097933c8---9839579356.pdf
    • http://www.prctech-th.com/ckfinder/userfiles/files/fizimaberud.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613656152a981---maripivigugenevunipo.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAB 16792 bytes
font_01_sfnt_off0000f6bd.bin
8f95215aaa21dbf536ed193612c1e05f28aa903f94e18fc16668208f43a69af8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BD 18196 bytes
font_02_sfnt_off00012716.bin
96ba9ce0cab7bb3fadd0b09b4035ab7fcd4c4b54cfc4806ed9d83f865c615ba8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12716 10800 bytes