Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e13bf7e9845731…

MALICIOUS

PDF

103.4 KB Created: 2021-09-19 13:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 65a952838b331cfb8302d133e74c6c02 SHA-1: f7e9bd3a21d37741d6a69295e4e3b590905a7d24 SHA-256: a6e13bf7e9845731662a924d8f037bbf5f3d575666b98f3a4a8ca4c41658fd51
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the document structure and URL analysis point to a phishing or SEO-poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/e1d2o5uq66pvbvd8sev7di0gbd/25316978656.pdf In PDF document text
    • https://rumputhijau.com/contents/files/22395240962.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613113c1bdf8d---65530765243.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/ruvuzuwilibodotowukapum.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210907051242.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/42b9e20064263092a93f6ede968156fa/tivenegufudowizazixaze.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/49376434123.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9d14d0a25---betutubur.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/kavidiwogonibatozoxipus.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/livetimubuvigub.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/94360552378.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/kewudutosezopegexuvuwix.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/dirogelagumazavijipefuvan.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/27548203682.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/zesapomekilizixop.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/mamvc816pd5ehqn9ovaimrmbmk/90895147868.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/jeponuwagawaruwusawed.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/gefufumonadenuwuri.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/093ec0913a0b1574954357e55b8339c4/57979123776.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/zemejuziwuwezopigisofen.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/91617185985.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/zadizapilovelijimameru.pdfIn PDF document text
    • http://yjccnc.com/upload/files/nimopenigodunitumerujote.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/bebukufigebuli.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2e64d16a6---66074196796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pragmatics+english+languagePDF 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_off00012ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC3 18852 bytes
SHA-256: e14e0754de0474d7f3a07cdb29a884405b2bac41ec4f263de87b3898915f8221
font_01_sfnt_off00015f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000177a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177A8 10660 bytes
SHA-256: b6abaddc3b58d2123515e8fb6633f00e59e2ef5d6074158013a98ccda183fdec