Malicious PDF — malware analysis report

Static analysis result for SHA-256 5599b51aec346c25…

MALICIOUS

PDF

85.6 KB Created: 2021-08-15 08:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74604490961f6a4feb66de5361ec7b20 SHA-1: 891492a893edf7fb2851768489d7c2b36cd0111f SHA-256: 5599b51aec346c25ba19459f63f5fb2d7a1502747ca180529453fe22e78f8787
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious redirection attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pistant.ru/uplcv?utm_term=how+do+i+connect+my+ue+boom+to+my+macbook
    • https://zohopin.com/calisma2/files/uploads/xofovezifupamemirapino.pdf
    • https://georeno.ca/userfiles/files/38809086427.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/4bb0d80dc3e2cdb652a00593bf331f52/nerasizaladevesipe.pdf
    • http://dailymaytrogiang.com/userfiles/files/53190536844.pdf
    • http://learnazia.com/fck/imagesfile/6234332851.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/e8c31b2cd00655b0f97bec08fbbc11de/75167724576.pdf
    • https://peintures-descours.fr/fichier/files/jaresipitemidumoxiz.pdf
    • http://jshanwoo.com/ckfinder/userfiles/files/pugojajemijesufup.pdf
    • https://radio-aurea.eu/files/file/pubonegolilojevobag.pdf
    • http://neonatal-surgery.ru/userfiles/files/zevopubapurozokozoxelopo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7249344e32---32697529583.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/f833fbb38acdcc959e5c00610fda0d4b/jotelikozexufomo.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/vn9113sg410t1qjrtm5v3so0k3/tipudobofu.pdf
    • https://glycocalyx.nl/userfiles/image/file/zajidarivajebabari.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d793200e49---voroxewamimaluratem.pdf
    • https://horkolas-gatlas.hu/ufiles/file/jitujewu.pdf
    • https://myparrotfood.com/user_files/files/jasaxipigev.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/pumijoj.pdf
    • http://botosani.ro/img/uploads/file/kutifigitunise.pdf
    • http://bajajsports.com/userfiles/file/65551181320.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160abcdda44cfd---48337236223.pdf
    • 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_off0000ebc8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC8 16792 bytes
font_01_sfnt_off000103df.bin
b98ac9a322f28b652b5a0ae1c580554affa3eda7e8905d0fb9ea3c7eaab172cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x103DF 10740 bytes
font_02_sfnt_off00011c94.bin
d822588d9523bc368756b3412dcfee118a1f79b2214e595d172720ddfb2f12fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C94 17240 bytes