Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b46d7f478beac0…

MALICIOUS

PDF

75.1 KB Created: 2021-09-17 07:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 431f24a010936e45e648d4db426f74ab SHA-1: d922d9e8d9e49197f386f1ef7a1aaa3f98b137de SHA-256: 21b46d7f478beac0b4494a5e166345ae4290e598b9816caa9930a7edd6633f8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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 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://tsafar.ir/basefile/tsafarir/files/kivokukopu.pdf
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/11058235356.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/sh7lpe4ob5jb0nk3k5arnuh5lv/20942815889.pdf
    • http://bmfjhjk.friend-match.com/upload/files/80514992387.pdf
    • http://studiocalcinoni.com/userfiles/files/76369157044.pdf
    • http://websteravelandscaping.com/editorData/file/dajesavejetejinavakaziku.pdf
    • http://tantusmarina.com/UserFiles/file/safijizonupovoger.pdf
    • http://jlsxjy.com/right/UploadFile/file///2021091117181173499.pdf
    • https://arte-salon.ru/upload_picture/17931320423.pdf
    • https://petpetmates.com/files/editor/file/kelam.pdf
    • https://penzionradvanice.cz/res/file/lobedodotokoxekasaxomim.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/3e5ae012e2cab92735400c2d77d1db4c/tasopofukuvitakabulifo.pdf
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nadozobutagiwegape.pdf
    • https://hanomanberjaya.com/contents/files/94640349247.pdf
    • http://letdentalab.com/img/files/77138497090.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16135d8f524f71---92223333299.pdf
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/60102500897.pdf
    • http://cgl.lu/userfiles/files/jawasusoruvobexilur.pdf
    • http://ride.hu/images/uploads/files/89020173969.pdf
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83839161477.pdf
    • https://swaarm.de/app/webroot/upload/files/90179041394.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1a61475d2---67346247443.pdf
    • http://konikanarrowfab.com/ckfinder/userfiles/files/wepan.pdf
    • http://erex.hu/upload/file/buxuzopozufejipibuda.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=peppermint+streaming+vf
    • 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_off0000c116.bin
2fb67cd8c1f05ac3ca71c699c04b52e95e649b6c62b3dcb1362add85f45dfe8f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC116 10600 bytes
font_01_sfnt_off0000d958.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD958 16792 bytes
font_02_sfnt_off0000f16a.bin
e7057d0516abd3f2d7996406c3394788eafb81d2bec2829e8a5254d33800e55d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF16A 17680 bytes