Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ec113fb740026d…

MALICIOUS

PDF

73.6 KB Created: 2021-09-06 02:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: eab3efd7c2d0070ccd0f09438fa1b92a SHA-1: ce15ea14d6be51c8af9472f8e980d70351f5d002 SHA-256: a0ec113fb740026d63cafbe5e8ac51fde26dd04c3a6f2720af37d860bfd64e1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to compromised websites. The presence of embedded URLs and the structure of the PDF point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://garglob.ru/uplcv?utm_term=split+half+method+pdf PDF link annotation
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5a1a59fc7---72519874860.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ba609a867---fuwuluvijozupetudagavosa.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/6e720a09873b0105a55345cd663165c9/85850882126.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a044fda00008bd503b540154fe9a2d04/5502618864.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/nojnfqspfg1120bl6u6ddhcgv0/soboregusibaxiz.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/dapazaxupojuliwovudomu.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794b6c29f2b---83380346226.pdfIn PDF document text
    • http://parentini.it/userfiles/files/wusimamelujomepekipi.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/18173126853.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/43359531956.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/zulorupoke.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/4818740436.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a56f71ab258---31764742833.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c06d354441---rinikelupaf.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/42117454720.pdfIn PDF document text
    • https://unaizahic.com/Files/files/dekupevubo.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf7ead770b---gizanusifisizaf.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/tugekafokugiwexed.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/22283398518.pdfIn PDF document text
    • http://apogeeconsultancy.com/upload/files/bapot.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/bopolelulodufuzenisirito.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/mokinomosunukiru.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f797ec19e---56711500488.pdfIn PDF document text
    • https://cmetrix.net/ckfinder/userfiles/files/64461391004.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210607135208_389835144.pdfIn PDF document text
    • 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_off0000bfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDF 10468 bytes
SHA-256: c9bccfc474277fbb7eca19946598802ceaa9b8d3423625db93bbf416935e3b54
font_01_sfnt_off0000d7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB4 16096 bytes
SHA-256: 6468d938202bc672cd2374a6610f2314daaf58b26634c0aeae2748fdc67628d8

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