Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5cedb3f081ae822…

MALICIOUS

PDF

86.4 KB Created: 2021-07-04 03:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aca02eebfe4654dbdeea9877b55421bc SHA-1: 9870fc2c5bb46315eb8c3269f53c696f5250de62 SHA-256: a5cedb3f081ae82250bd2399a91cbf8b89c26aa010cd83d28dfa9d1c820bfa03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing malware through these links. The structure suggests a link farm designed to manipulate search engine results or lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/be8d689cd2120ceb59be4a81af61d3e0/winigekored.pdf
    • http://orkoien.com/userfiles/files/242157843.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5ovvchemcs5em56dju8p59e6i0/vasuwivifapakedo.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607246203164a---bugogekesurexo.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ffeacbe8d---bofuwepepab.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/di1i894pv3hsq4d3sqqvi6ggdc/vesokugewelijeno.pdf
    • https://yz-yongzhong.com/upfiles/editor/files/rusobunuk.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf9b3e04f9---woxanamujaxitaxilone.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/1tbmqi12msh54tdgt0fq5osql4/31698482853.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ba8418087---wesibagan.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/bd53p5seeeeutc1akcievu013r/72980937356.pdf
    • http://kadh.kr/bobod/upload/file/2576529220.pdf
    • http://consulcongress.it/uploads/assets/file/jituf.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/2350ce5d9d6f7770cae913fc24f6ce78/tafuvosubaf.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b08ea79d3---16732927418.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9b234f747---vopabipebe.pdf
    • https://chp-travel.ir/data/file/posikuselamefevineser.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3722dcd880---pevar.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607765af49c8e---53098111042.pdf
    • http://aucoindeshalles.com/menu/file/61999637641.pdf
    • https://hohsingfiber.com/ufiles/files/82717465479.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d122bdf988---ripovogaw.pdf
    • http://decaiyun.com/upload/file/21062023431688515083kn1iz3ai5i.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/5366c3e12bef9ff80149d44cb1b81c48/mitixonasiz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+draw+a+giraffe+head+and+neck
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F5 16792 bytes
font_01_sfnt_off0001090c.bin
d635fba2abcdb489637719fa3315d28081007322500ddca662457c98d26a5a1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1090C 10708 bytes
font_02_sfnt_off0001215c.bin
3be91f4f5a591274fe81144d5dceecb8e713d5e5235d98049d9230a5111c0e05
pdf-font-stream PDF embedded font (sfnt) at offset 0x1215C 16572 bytes