Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8e2b4903690810…

MALICIOUS

PDF

92.8 KB Created: 2021-08-10 04:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ad5b616a0429100c9300d3c5b3af559d SHA-1: 130a021e8f64038678e46675d7e855c1b00fe9ad SHA-256: 3d8e2b49036908104d934bbb2e5f893cc3205f13b427d269975c333929477ee5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for phishing or malware. The presence of multiple links on disposable hosting and compromised CMS uploads suggests an effort to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/e5b3cc77af19c7b2de4acf7d5e22f205/pitexu.pdf In PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/a909f71dc8b631357d4fe2da8f0c02b5/86258775787.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c8e07a65---22114927626.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b661b4651cf---goxelogi.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/24029917393.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/rclsp5avbn5sialum1u9j00isa/gegebefu.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/99931018465.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7a35db286---28026855328.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/7bd7cd3557b81caf019ac6f8da30993c/13593718784.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/m2ph8a8s7df90ojhn6q7qdc326/beropubanokalewitavofire.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/fakujoresazesej.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/tekowosunogekuvaregewo.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd460da214---kawizikusadaw.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/0b36a3b8ecfc490ab05493443ff049e7/fimuvije.pdfIn PDF document text
    • http://grandfiltr.com/files/file/pironetejaj.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b052ce931c6---10337168001.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/2e308338d3f84c45ead4993c86930679/mureroxak.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2a63dea23---werafomipujopagabedezali.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53686964338.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b663f775529---12648225484.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2fb23112e---46762809768.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/kesuzisagazezomitupuziba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=assistir+o+filme+as+vantagens+de+ser+invisivel+dublado+completoPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D5 11248 bytes
SHA-256: 5e4cc8d1b5f9080623bff1d37ebbdcea062d093dc24d31b53e94247fe213cc44
font_02_sfnt_off000132cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CF 19648 bytes
SHA-256: 354de1186b0fd03f0b13a1cb07aceb75514fc858081a83d4a49c2889837535d4

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