Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5a0adf49618751…

MALICIOUS

PDF

75.4 KB Created: 2021-09-17 07:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ca81750011a297a863725535501425a1 SHA-1: 0a63b6a2d8c5dc591e052c4f844ab6ded0b37d64 SHA-256: 1b5a0adf496187516e57587a8525809340822c585d24f65abebe4a0bfba50bf4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a URL with a 'download gta vice city mobile' UTM term indicates a lure for users seeking game downloads. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=download+gta+vice+city+mobile PDF link annotation
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/a24fe0311237906ffab8ca4b0ce8484e/lalumimogu.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/gavowowuxawidodubovatad.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/90016126471.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/86030847148.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/ranefejajolemivasurenasat.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/76272602028.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/rotepuliwaxosapogonopotil.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422055ccbf1---forulegudowe.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/tedep.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109062351359685.pdfIn PDF document text
    • http://3q1p.com/upload/file/210901120025996376dk1cs40sb0gw.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210905_001247.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090904111073499.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/38800685837.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/wezil.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/napekepel.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e42204462---46480375770.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/ravujonepagovatudozeluj.pdfIn PDF document text
    • http://www.moyekolodin.com/files/tukunorominesilumokozak.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c74f306b938606db0dd4e02775c49cc1/42223681549.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/butumodapewenagu.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/35628222178.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_off0000c44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44C 16484 bytes
SHA-256: e1539043989105d00fb732a8736705872e8bdb68d2c0531438c3df78d6b69794
font_01_sfnt_off0000eebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBB 10852 bytes
SHA-256: 4ae9174ab757239dadc624dd17c4435d20c91ffda4b169c3dace936d8bf1617d
font_02_sfnt_off000107a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1