Malicious PDF — malware analysis report

Static analysis result for SHA-256 7624612551aebb7d…

MALICIOUS

PDF

69.9 KB Created: 2021-09-30 13:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 494a2ae681b242a164487b3a210f3740 SHA-1: 0d7e257b83b818292b4a77c16a5e1aa9708e5f84 SHA-256: 7624612551aebb7de35f9157283069beb979a77bb816b4822b5565ddb666c2df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The document body is unreadable, but the heuristics and URL analysis clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://speedwayinfo.hu/uploads/file/68627493986.pdf
    • http://www.huescalamagiaenfotos.com/userfiles/files/bikoregum.pdf
    • http://aptekarynek.pl/zdjecia/fck/file/jajonoreruwubegaburodaxim.pdf
    • http://sous-mama.org/userfiles/file/zisekulesokonirakifire.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/f2c8ad7738407a8db5219ef96e0fabfc/naxabikozofu.pdf
    • https://washlounge.in/ckfinder/userfiles/files/58067320093.pdf
    • http://worldcar.jp/userfiles/files/66074427487.pdf
    • http://polyacer-ecp.com/userfiles/files/20210905_071635.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613be4d5d5bf9---nesogijoji.pdf
    • https://siliconautomation.com/userfiles/file/nuketufekedaberudisopiv.pdf
    • http://fotografieindex.nl/images/uploads/vituzanav.pdf
    • http://www.bash.cl/media/file/lerafi.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140272e12c5a---1694709003.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147a9f44288a---44941404744.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161502883a247a---598446740.pdf
    • https://astefin.ro/ckfinder/userfiles/files/rabogejumiragavixipovo.pdf
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/milijajodekufape.pdf
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/mabejulu.pdf
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/lagudisa.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/851885c1c5a294589500fe5c4b36738e/sutepoli.pdf
    • http://nitecoreromania.ro/files/file/tamulujafegixatizi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=50+shades+of+gray+movie+online+free
    • 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_off0000ae2b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE2B 16792 bytes
font_01_sfnt_off0000c642.bin
e2b670531599dc554024100b72f2afd91e5b980dfb1bd34328609a90f6c74091
pdf-font-stream PDF embedded font (sfnt) at offset 0xC642 11040 bytes
font_02_sfnt_off0000df97.bin
3c76a555d1a6e25117d7bb8e80adeff95b95b8959b55281857ac722d48a03470
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF97 16688 bytes