Malicious PDF — malware analysis report

Static analysis result for SHA-256 6426801ead71e736…

MALICIOUS

PDF

84.4 KB Created: 2021-09-01 18:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fdffacc61800956d9a9061db2df3ed92 SHA-1: ba1cae65ea39914b709fd6b9a4546256ff8d6842 SHA-256: 6426801ead71e736f4b1b5a33776a264d6d0f2a04c36c9d08ba599df41774588
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external URIs and is identified as a link farm, likely intended to direct users to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution campaigns. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://oniceh.ru/uplcv?utm_term=4+pdf+in+one+page PDF link annotation
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc61669ee77---93002310966.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/femumuvovulegilu.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/36964078433.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75604083877.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/caca07389946b82a5ea183b6fea4ea38/nofenuwezijetun.pdfIn PDF document text
    • http://thegioioto.store/upload/files/86780622147.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/pco3ilj4k7pg572vq9fchklmjb/rabidirutodexesafovuko.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fa677ab91---4688685802.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/wesam.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d74ccc6adf---90571470308.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/fijosewuguge.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/1983163077.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/1518718531.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608167336d2db---ganukejaxejeju.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1897fecdfe---12000426147.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/67091243987.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747c875d06d---xolorijiriwovuwoxokonax.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/rimakexedivo.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/rowosanuralujim.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/b8ed03dd26d6ae19ecbb1a1707fe4329/gafisumajorepef.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0149c4507---nogegujaxagudaxodotilumiv.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7b392dbd42d90a43f2053fa055660a4/pasumomepirimorejelonarex.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b84a02e4ad---54014397439.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_off0000e3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC09 19400 bytes
SHA-256: c12c5c666ae57ceac5639ec93edb35d785fd12174e99ee0279ebca420800ca2d
font_02_sfnt_off00012d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D27 10244 bytes
SHA-256: 4014f9c8bab17f9887b45e80fb3cfbad707f40bc3e5eefdd1c16aeca4ef44b5a

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