Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f61c36cb6614c5…

MALICIOUS

PDF

73.1 KB Created: 2021-09-05 19:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ca801be5aba2afb4a5c30d7d4555af4c SHA-1: 4d321acd57962921ccb823f03fa8f0373827260a SHA-256: 64f61c36cb6614c559b41835c8a7c6dff74f24c4898bfb713421e6083e945edf
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to external websites, including those hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be acting as a link farm to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://memoservicesrl.it/file/davadepuxixorepemevo.pdf In PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d400c66255---47468330197.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/6176d749cacdcbf2b948262b28344a40/fasomonukirotumajikero.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/sezepuke.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/75055547373.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/kavaruxuzulerazag.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/bovatonanon.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/56772081013.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/85038485191.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1f73380bf---64916977917.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/1352523031.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/rorek.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/rilosupotemuru.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f677c15cb---14781403024.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/52204587390.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/mikujofu.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607922d99edbf---94619302969.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/u7llpihg136m9g3vd70udmrtv2/pebedogemiforafus.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/ucctmjear9o58r3d2lhn0t415v/jeginukojorixu.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/95443578383.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202108301559232513.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/v4eik5hag1u0uh1hg0bnagjoep/25908966606.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/1124d59fb862c149d8bb671779de59e7/dalolikeredikopafajotoxo.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/9e6419c1c48c4042df02de0ef1eb2e93/wakalalelatijasigo.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608be3b7abc64---24204064584.pdfIn PDF document text
    • http://www.hmcpacking.com/uploads/files/10497417916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=photography+poses+for+couples+outdoors+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_off0000bc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3A 16160 bytes
SHA-256: a3f5b4d7c6ab573d60ac721f98d86731a5e064d34fd802047b092b5058cbb5c5
font_01_sfnt_off0000e543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE543 10920 bytes
SHA-256: 7e00c922304f6539a2801a7d15a57c040f5b2cf59be9a49b5ba8fe3314a206a4
font_02_sfnt_off0000fe9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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