Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e28440bfa8e4e3…

MALICIOUS

PDF

75.0 KB Created: 2021-06-26 23:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71d4cb307f8b060ef9714609e69c8982 SHA-1: d3d6b99ced779a97f065551cf07cd06429c6c739 SHA-256: 42e28440bfa8e4e325ef6747fbe1d603ef90faff2307df8c19c95653ccf7aee9
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or SEO poisoning campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous links on disposable or compromised hosting reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c956afcd6---19920343850.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ea611920d---kenafometewud.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16086a2dada949---kikizexikut.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec0bf24ff2---62339595179.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/g74de5ts0q9tq4amt7g5j4flda/59397073439.pdf
    • https://cplastik.cz/data/cms/file/57442227147.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/v8iio7iauqddo85mcmhap75ih3/xuworazimiwulalutis.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c14baa2fbe---xuzagerexilik.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16091cf40dbc3f---gurulunefaferebedomam.pdf
    • https://advance-pack.com/editor_upload/file/sadebopefuf.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1eacd1a3b---nefafaloz.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/436a2eb342a9a4b3d5505993f5523631/kuzifafa.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/a8e479201dc2e6595eb38c643502b4cf/34305057543.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/952be8e2da4869dee013f223c8e2d897/77699778.pdf
    • http://balone.net/_upload/file///tasomeraro.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/a2483c00e971593b044ad088982ddeee/dukag.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c72e448e7---defipexolu.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/41562484672.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076190e0476f---sevojuxokeriri.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a937cbd35d3---70345546857.pdf
    • https://costabravas.com/uploads/localidades/files/kegixudugukuzakub.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083e3a139b04---51513062774.pdf
    • https://dock-levellers.com/upload/files/woposasomij.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160961516d1434---xugegaxamogizav.pdf
    • http://orchid-daikanyama.com/userfiles/file/xipabenapezizesekaras.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=keep+your+good+news+to+yourself+quotes
    • 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_off0000c27e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC27E 16792 bytes
font_01_sfnt_off0000da90.bin
807aaaa843703c865d7e993afe45d4b3a19c3c339047ba19e34ad2c645aabafa
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA90 16892 bytes
font_02_sfnt_off000105ce.bin
c69a2bcec32bc1d5d9691f68a21d91bc9b9cd798fbc6f14677b94386a18b94a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x105CE 10856 bytes