Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72ec6732f834f6f…

MALICIOUS

PDF

87.5 KB Created: 2021-07-14 06:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1473cba1b42834fe10811be5a9c24712 SHA-1: eb22e25dafa1ef923d05d2058db3ee74faa794f6 SHA-256: b72ec6732f834f6ff4b1f620a5b377b66b7bb5fc1f83363e576046ba9717d004
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating it functions as a link farm. The primary goal appears to be directing users to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://clasesholandes.com/userfiles/file/32699214900.pdf
    • https://amursvoidom.ru/media/files/25599157779.pdf
    • http://accessiblevehicleservices.com/userfiles/file/gezelajatikap.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/7tihh6jlnea2339dr8fnosaecd/9927290565.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/jejuridolitokuvilikela.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/l0vb0n8av5mhr698g1o29pgblk/17485787475.pdf
    • https://kompaspt1.com/contents//files/daduzufezabitekekivusa.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a07a7805261---makivaladomerojujupanafi.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddb529cabf---22420874021.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/9d5e411a57aae556bcec9f2a8f5d0ef5/58066742615.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec2545c0cd---16827213782.pdf
    • https://annjulieskarpmo.com/userfiles/file/nubagavasiraxabimem.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e9b4cac4d---mebijavelaloreguxon.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ncsh9is4dbh84bi933amtrv2uc/tuniva.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/daff3fe7b121e5c1712e70c368b2865c/70708267358.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/839072c0064120d26386e9e42275c9b0/zeredid.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b1672f18651---kutomatina.pdf
    • http://pusancard.com/userData/board/file/manibodupimuja.pdf
    • http://shinies.ru/img/lib/file/95131496716.pdf
    • http://anapro.com/ckfinder/userfiles/files/84936859687.pdf
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/mujuwumun.pdf
    • https://datajournonepal.org/files/latife.pdf
    • http://schodylux.pl/userfiles/file/joxatifegevelosarufojefi.pdf
    • http://consulcongress.it/uploads/assets/file/13176452815.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec7de159f1---35624026135.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=kidney+stones+treatment+foods+to+eat
    • 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_off0000f661.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF661 16792 bytes
font_01_sfnt_off00010e73.bin
3d2499e8bc7036e096adda3c5addb332b703dc665498ecb4ca87047ff1ca5513
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E73 16164 bytes
font_02_sfnt_off00013859.bin
e90a972b8fd43e85820d8657e5982bb65a75ccb562b528061e78cdc8b4551674
pdf-font-stream PDF embedded font (sfnt) at offset 0x13859 10572 bytes