Malicious PDF — malware analysis report

Static analysis result for SHA-256 429f245ddefefbd3…

MALICIOUS

PDF

94.5 KB Created: 2021-08-17 12:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 76811dfaa40df1d4b2f3fc09305e8f2b SHA-1: f133a407cca35dafdeb6dbb722f327ed0a5feb18 SHA-256: 429f245ddefefbd31e9f278d24f579d9c6e60e0f99ae97c8b51f158e765259bf
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, a common technique for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The sample's structure and URL patterns suggest it is designed to lure users into clicking links that lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b759aedb4d5---79674683724.pdf In PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3e966d7b5---6298640874.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac97958e5a---59228660247.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/18876979203.pdfIn PDF document text
    • http://freeski.hu/freeski/file/54500651689.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/543ccc24bc71fca7d4c7c052431c2893/99511542109.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/2d510792b5fb670e34dc5ca0a19c6545/74838900999.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/f8395528e4dab3d67e5550e4a4c49f2f/gixazureranobonalifamuze.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/43121943500.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962a96bc810---kovujop.pdfIn PDF document text
    • https://bczenekar.hu/files/file/18758383460.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/ab6896491b8e778797bbf90d523d7761/31401480105.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/1c5qrpl6jnqf9o0hm0csgeg6f4/jemixadefexobufonefevoge.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/35131708376.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/legerapozegilo.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/kafemev.pdfIn PDF document text
    • http://3sdent.com/upload/files/lazalekafebum.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f0ac58ec6a2---dikirewososafili.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/titazabuturakisasap.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/mexuwatofow.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/roxemewabasotaxa.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2ef3d3567---99248934047.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/lenadivifobedajuguni.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/dikivarutupabibadobob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=terraria+magic+weapons+tier+list+1.4PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001089a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089A 1800 bytes
SHA-256: c18822d384335bb15b3801f451ac6006b24d35920f4d7c500836c5673bd1260d
font_02_sfnt_off0001110f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110F 16748 bytes
SHA-256: 67ad09eb5171ed74cc5ae386cf9c1a4b94f8521ae0e14f0ab5ccb6194c274e92
font_03_sfnt_off00013cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD4 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_04_sfnt_off0001521a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1521A 10964 bytes
SHA-256: a12a1e572fa0458de0ec081c04990dd2ca35a949cd6cd0786fc2e8c4aac0c1e2

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