Malicious PDF — malware analysis report

Static analysis result for SHA-256 b76cd5b4bc709674…

MALICIOUS

PDF

83.2 KB Created: 2021-06-25 20:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ecc83e110a0282a32aa8be529bba4b5 SHA-1: abd6790d92b7aeb57bbcc985d9bef29e9b4e676d SHA-256: b76cd5b4bc709674c333dda6891b0c79201a8cf8e1ce5ce8727e13cd08345c25
196 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external links and the nature of the hosting suggest a redirection mechanism to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/8203a547a8d7d1917b056c90175902ae/meselanogofodek.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/vulelakopovimiditid.pdf
    • http://afghansolar.com/userfiles/file/kulewipa.pdf
    • http://frezerovka.by/images/fxeditor/file/87885668117.pdf
    • http://ctkupavna.ru/upload/file/ruluropagala.pdf
    • http://otvorene-srdce.sk/userfiles/file/90729320088.pdf
    • http://www.bandungmesin.com/file/79183520943.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/3uqla0i9ng2om5s2duo8d4k0d2/61086255273.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608be01839421---27971783584.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/t0pfbb2eqfpudbtbaob502d0j9/14981623996.pdf
    • http://cfacgroupe.com/uploads/FCK_files/file/lasoxikuvunusawadugo.pdf
    • http://barudan.hk/UploadFile/file/20210529154213083.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607db80c3f9b7---wizutudubenokunewowade.pdf
    • http://fonnepal.org/userfiles/file/39923247320.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b9197eed9---fepuj.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92b6ae88e---7470202648.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/74113735322.pdf
    • https://travelinnsuites.com/nbloom/fckuploads/file/30794078468.pdf
    • https://alkirbilaw.com/userfiles/files/57594274117.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/8c2toeg1a6nkcha3o2308224s8/43621869133.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ffnlougfav5tc5nq9f20uak9qi/13568927798.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/ci5h6sght14medf23lt5h2njc1/nuxikelurujubigobak.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abc2b2ac02---zutaraludurabadov.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+is+a+fracture+different+from+a+break
    • https://medlineplus.gov/fractures.html
    • 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_off0000e45f.bin
468d1a6ff9b23bb08e417db498a670fc28d00e1ee5e24b884d062e032a5d2c14
pdf-font-stream PDF embedded font (sfnt) at offset 0xE45F 11000 bytes
font_01_sfnt_off0000fdfe.bin
a0c967e2ee398b7624b92c7d9cf0a16711d0bc652ddaf2e3c8c73096d98287a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFE 16088 bytes
font_02_sfnt_off0001274e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1274E 16792 bytes