Malicious PDF — malware analysis report

Static analysis result for SHA-256 c523195dbabaa1cd…

MALICIOUS

PDF

96.3 KB Created: 2021-07-02 14:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b831dcc6ca881cb628c4d083e0b11817 SHA-1: 5f9f13be4751dcda90b695f9ee4ef477be08f280 SHA-256: c523195dbabaa1cd4eb88d4fc2843e0876355321efe6a0478aca2f558ec9da42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://coretry.ru/uplcv?utm_term=cheat+coin+master+iphone
    • http://alexlunacoach.com/img/editor/file/zesozogikibixiravigo.pdf
    • https://skatrip.com/basefile/skatripcom/files/vizisinapobaxaritedurib.pdf
    • https://najlepsze-w-polsce.pl/uploads/dixabawezabemesejajavixu.pdf
    • http://gramercy-grand.ru/files/file/9867185013.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/aklfe9nqe458t0i9alvc92e90f/nitogosemika.pdf
    • http://healthywithhart.com/res/file/toxawubelanesak.pdf
    • https://floresdeserrezuela.com/aym_image/files/36101426761.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9c406f78c.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/eea5d76e2efbddfbdf064bd0d447c6b7/12847678368.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083d75767f1e---32862049978.pdf
    • http://nousgarage.com/userfiles/file/70660358905.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738350c6349---37498577746.pdf
    • https://seedomoretravel.com/files/files/bujamunamirazizugaz.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64354c6454---wamagixuretolokokemafefar.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06ee290b78---wugubi.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/c3b3857a8180ea753001a421a5035b24/88314547741.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38b6d51a65---nizevezi.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5b0a74dee---26320146789.pdf
    • http://dwhs79.com/clients/15834/File/49135190850.pdf
    • http://www.tomasjelinek.com/img/pub/file/nupigizodinavanati.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b8b6f24f4---49234814609.pdf
    • http://ssujaxchapter.com/clients/83257/File/25936725975.pdf
    • https://tonitomov.com/picture/file/831859667.pdf
    • http://agcslohian.com/userfiles/file/buminevav.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/31ddai8okj0cckt3r14ghcnl9c/jirenejokemokasitogoruw.pdf
    • http://limuzine.md/userfiles/file/panizodaxazotovap.pdf
    • 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_off000113b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113B1 16792 bytes
font_01_sfnt_off00012bc3.bin
f0416bf3396c64a25b4afcf250f8390beb1b2998c65fc1495557c835568f7e15
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC3 18196 bytes
font_02_sfnt_off00015b8d.bin
c702acb7a29ec5ac64e7298669c9ec08eef3fef1f10fb7f80db616bf51ef27a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B8D 10624 bytes