Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c80b05c4bd76018…

MALICIOUS

PDF

70.8 KB Created: 2021-09-01 01:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7df4e94c6f7c049445d3fdea685b89f5 SHA-1: 25ca59c014dcba0df67d687541f1792ecc8cac7d SHA-256: 4c80b05c4bd76018b56bf60e263b7fdeaf430b5785121f687c16c97525567e41
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content or phishing pages. The document's structure, being image-heavy with minimal text and a click-outward action, further supports its use as a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pistant.ru/uplcv?utm_term=microvilli+and+goblet+cells+are+associated+with+which+tissue PDF link annotation
    • https://migger.dk/userimages/file/sepeke.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/33367733821.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d255de2389---vikatibinas.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/wakadubuvemetimi.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8784db32e---44598265025.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/msgmbokikg0oh4i6ggj9e2fto9/musuja.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16081921ea7d11---61831992923.pdfIn PDF document text
    • http://belovosushi.ru/files/ranedepesug.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/popufodukigako.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/patavefewosezepawalemuxov.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/52080538437.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/368ead0cb6fe44e1d302eb67fd931f65/pupavugozoraripune.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/agjmhs54k96003kck1ca34k9mf/xezolor.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/6824d34cf6f3a3ec460dabb956aff11f/65712195013.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a6a18beacda7b379b3a91763c8a21d5a/rodifuvapokedufa.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/gp8iqmhov2crf5pvcd0drpn921/48266352026.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608340584b24d---pavokewomisug.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae81cb54631---gatexipib.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3e4abde58---majofenipubijamorodirek.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/sogaxa.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/bivovosebu.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16078569b77a84---44257105818.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_off0000b78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78C 13712 bytes
SHA-256: a0e14554f34a5cc456d9da6b4c34c9efed8633aa5457a3d66535195c82bbe0f7
font_01_sfnt_off0000d8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10D 11036 bytes
SHA-256: 91a35e9a2d31fdef50f6d839b14e1c7eb2bd7c33b7a9acbcdbf35729bb26b264

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