Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd993196b127705…

MALICIOUS

PDF

90.5 KB Created: 2021-07-20 19:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c23aa617e2c252e84ebfd5deceb077ce SHA-1: 57afd037798a1add4b7ebc6018a6e99a95f37416 SHA-256: 5fd993196b12770568194750c220437a41d18d679484d86730cbb1b8844aab42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample was flagged by multiple heuristics as a link farm, directing users to various compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs point to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16099eacabaa29---96374098609.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834ec26f477---konotowadowugezezufeji.pdf
    • https://asoriofrio.org/ckfinder/userfiles/files/66791507306.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd46361b539---satanebapo.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/d015acbff9f736a61c97c5feb25340f2/jufujadejup.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/4ef66d6e30b0178b9eb08a25cc40f6fb/bujuduki.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/b7efb5cd86e476639014ef222785d483/79210748378.pdf
    • https://nadamasristorante.it/file/4863108581.pdf
    • https://daxitrip.com/basefile/daxitripcom/files/78708840210.pdf
    • http://anhopphat.com/uploads/files/53845221581.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3f5e0971c54259b412daafde8a5b6016/zodesimifugebed.pdf
    • http://bociany.sk/media/file/jejagagisipepameteti.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607492677f99b---17640771833.pdf
    • https://planet-for-events.de/userfiles/file/75633269013.pdf
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/q6d74m46c887m5o14jiofq9qbr/wudidez.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160889888196cf---94528263776.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/768d3937a0b88f6b71716e0864046f73/23983556461.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/f772b0ca01ff91819e9db33e0cf5b098/6545430406.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/08e5c35e74df4ee37674148434e7ebbc/velowawosuzezamilad.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/8710ce055ab63f6ee34e468e8c06aea4/45962111268.pdf
    • https://lotteppta.com/beta/assets/file/rilugogusutixata.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160860e5f37260---96746781405.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=answers+to+4+pics+1+word+game
    • 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_off0000ff31.bin
73a0144583f27e2fbf1aca5765d06aeb87fe019d984fb2f932fe75bfa2ff6e06
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF31 11008 bytes
font_01_sfnt_off000118be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118BE 16792 bytes
font_02_sfnt_off000130d0.bin
a22c2cea89ffaa491d6fa06d3f24d735047f18201add8ba892164f5efff9990f
pdf-font-stream PDF embedded font (sfnt) at offset 0x130D0 17000 bytes