Malicious PDF — malware analysis report

Static analysis result for SHA-256 1296aca3b1813c93…

MALICIOUS

PDF

72.1 KB Created: 2021-09-04 03:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3daa1429ca278f01c73de9f387b8294b SHA-1: fc6a44be7d4668af28b2a6905b878e61ba6acd6d SHA-256: 1296aca3b1813c9335336d94383b57b4cfc30ff7b0fcbdd603eb4415277a86fd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://thankschicken.com/uploads/files/74132764983.pdf In PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945a5d0cb1a---tibewasiwalurosadexajat.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/29888641526.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/08/09/retuguxufusiponema.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/72329169389.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f08247efc3---nijanisisibefi.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/97614650280.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/dotonitoki.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/niwexofomurofijebow.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/lafejigidumok.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/wutub.pdfIn PDF document text
    • http://aweibel.com/Photo/file/wamowikiwizosatomur.pdfIn PDF document text
    • http://fpole.ru/sadm_files/877884886.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/bnq9qi12c01as49lge3g5c8i8a/sasoxe.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160722420bc4b3---sixeridogotaxaf.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/mm0nod0vaak9ggi5sc2utd4bqn/kuzovenavajobowabunu.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610bd63f0bdb8---wijunuxevasupilajol.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a99f15e04---puzojeginubaxenebasivopeg.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/sawaforovegunejanavus.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/06588f1505e158f7045178fe670bf380/53940408927.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/30197476579.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210607095102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=respiratory+system+pdf+notesPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB09 15392 bytes
SHA-256: c5947b7b10aa4b2f86739a12f66eef038cbf787f289caa203991f6525b0c0ad8
font_01_sfnt_off0000e240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE240 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA57 10772 bytes
SHA-256: 7d80cefd449e2e67f2fca8381704e50e2af3e72fe6ff2feddc4716f698c3bd3c

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