Malicious PDF — malware analysis report

Static analysis result for SHA-256 5346ed02a6d2060d…

MALICIOUS

PDF

85.3 KB Created: 2021-06-28 03:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f5b3125c0b34ec52cc3e4bb76dc9f4f SHA-1: 0bf54d0e1ddc761cbaf7539a6a52d44173f6d29f SHA-256: 5346ed02a6d2060d02e7a090670a3e810cdf2276a07dc73f44554218bccbc829
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites and appear to be part of a link farm designed to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by directing users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2aaf628d17---lavapoxazakidezes.pdf
    • https://bio-obst-und-gemuese.de/userfiles/file/25040048357.pdf
    • http://batiment-tunisie.com/userfiles/file/foxuzeluwofapizogoton.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/f81dff3ecd33eb4424a1993bd29f63ea/xilig.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856beb5d49e---xufizanadekuxed.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/4b9b20a2077b9e9b068b1a30663fcde8/xadudemuva.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a83edaa8039---daris.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094ba6fd2601---39187576020.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093c951b1b32---satifipanapuwojurowupejuk.pdf
    • http://jun-travel.com/userfiles/file/wefamopelekesetawa.pdf
    • http://babamoleskine.com/files/file/dupisibife.pdf
    • http://bscartridge.com/pic/zigodamisaxebuxibebenese.pdf
    • http://tbff-bygg.se/img/files/kilokora.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1dab50cb9b---wosufuzasukovobepeveku.pdf
    • http://www.radanhorse.com/resource/files/3135310523.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909633c079d---rukobupi.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/f10aa889e220d6eec837e7b63cc8e89d/93701720991.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/cc4d8f03aaee487ae90d02c2641c49c3/54800173759.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/e4a8bde305fe2d904846337ee621dafd/81282544491.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a14207d70be---lobigepanulunefutidepere.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/69b90656631f4fe70c9f9a6615a0435e/sakufijiwewaxabukowebuse.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608f89af664f7---9168536899.pdf
    • http://eshop-kocicinadeje.cz/files/file/60045051794.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0f3fd83a5---biwipozev.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=downloadable+printable+loteria+cards+pdf+free
    • 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_off0000eaae.bin
a9127224e283a137d97d78afee876868983cf972e832797a773527976b4d669b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAE 10840 bytes
font_01_sfnt_off000103a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103A0 16792 bytes
font_02_sfnt_off00011bb2.bin
d5e08d3779568cade91a1f0a856dd13195607b130f669bde212e0723e44122f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB2 16860 bytes