Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9297a2501419cd…

MALICIOUS

PDF

105.6 KB Created: 2021-09-07 03:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 88f1da9f0ed2dfe2f4912276c4d63db0 SHA-1: 9e3c2b0cf5af8c5cee5a182f5815fa3f8481d207 SHA-256: 2f9297a2501419cd287e5da8053d7c052df6ac2fa8f3a95b482ba6119eb08352
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm hosted on multiple compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the structure and URL patterns are consistent with a malicious document designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608d780a21e61---taxumamukomosaxavuxasewav.pdf In PDF document text
    • http://newbiesites.com/userfiles/file/77954482036.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/3d3aa41199531c1b48595118868d3b49/77642030207.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/65235821300.pdfIn PDF document text
    • http://fpole.ru/sadm_files/tovesuxam.pdfIn PDF document text
    • http://prograsifkalip.com/files/kilibixusokex.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/fakibufel.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/lopiva.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/599698c756b037d5ab03ede613c46290/kumenunesonegupekozigam.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161260f71c149b---xonilasagijuxixibapadi.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/povofudotudowu.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdef0a54352---48951775737.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56097c2f1c---geneliwuval.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161158f58e73d9---lofurixuxonitixo.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210627203547476213jkjv8y.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/31056177519.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/05279rq3n66n79iqvntcafcgvv/64230721612.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/88401774408.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/19217517384.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c31ca82b3d1---41587296743.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a076c646c8c---48153293001.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5e803fa20bb904986b4c6290b9f0f242/terumaviwu.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210531113010.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160764a04b058e---12774225029.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3587b894f0b0813bf67ae1cc054452c2/zedarodijatebedi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=greek+sovereign+debt+crisis+pdfPDF 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_off0001343e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343E 19852 bytes
SHA-256: 8412ee3055b145ab073a6bda0e21e3a905b2bd3d5195b46519617c10922301cb
font_01_sfnt_off00016783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16783 10924 bytes
SHA-256: fcebf297aff6682ad8958682dea5170d5e837f925c21aabe7368e77bb96f00e6
font_02_sfnt_off00018097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18097 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1