Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1a6ac93cd359c3…

MALICIOUS

PDF

98.9 KB Created: 2021-08-05 15:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f7e720d39421a0a50dd2f35c825ebb3f SHA-1: d88a6e7878b225ccfb2c1336279289e0e0d57bd1 SHA-256: 3c1a6ac93cd359c309e1986eafc9aa8b7ed927e22a0e7460163a0f5c77c2b1ea
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDFs hosted on compromised websites, indicating a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is unreadable binary data, but the heuristics and URLs clearly show the intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.centralperdana.com/file/nepaforoko.pdf In PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/33962947949.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/dixizixaxuzulidaxotizotod.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/cde47603765cf6a61264399dfdd74d28/99371811422.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/ed8qk8tgek7mb1b7na320p06e7/74154169690.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161033cd892e03---wajirotufudezel.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/28848135110.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079723911ada---widideruzixejopuso.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/mobumalobifusugodifovi.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b744d37a99d---67860070459.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/zolema.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/62031608813.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/72435411160.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160be2520b2c57---sevenirelili.pdfIn PDF document text
    • https://summit-christian-academy.net/scauserfiles/files/82967407791.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/tanobafejetozuloxe.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/telijinivebediw.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/0e8e941c0c35882bdf8b8771028805c7/xizone.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/45314210063.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/48223565c8e6e661a51d29a8d54464c0/fojukuke.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210618_D47185C985D8EE95.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/wamapegapiwabijoxaxepib.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/mm3i71aooatfi48mktmj181sv5/nigiteponagufezaj.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/0706pdk9nngdsvs9e36dnatka5/nijaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=makkar+ielts+writing+task+1+pdf+2018PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE3 11224 bytes
SHA-256: 49e775794e8f60eb822ec5408f107486724dcf63871a6a988195ff00b56d14cd
font_01_sfnt_off00013645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13645 17752 bytes
SHA-256: d741497a2c423078562db83484455cc247c23a52c96edf3e0ba9021fd26c3fb6
font_02_sfnt_off00016455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16455 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1