Malicious PDF — malware analysis report

Static analysis result for SHA-256 de83abdb3518c897…

MALICIOUS

PDF

90.3 KB Created: 2021-07-03 07:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 878d5b55c08142259442115543a0e67f SHA-1: d5466d877f2f004488e952059850fb62ed020519 SHA-256: de83abdb3518c89733d3242b7cc7daeafbc0a2ab3b65eea7ffb2f4b3542ac958
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress installations and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae48d6be11---mukosowuxifape.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7e452ad37---49223752805.pdf
    • http://avandcie-energy.com/ckfinder/userfiles/files/75725516240.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/029culo4kljgpt3dp428e4kpoe/62336770538.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609da8ee6e511---26151732649.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16082d08ea0c2b---mojatuwazitasekutixomo.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa00921a35a---30421513438.pdf
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/21818432405.pdf
    • http://everettsbarbque.com/clients/b/b0/b0b566c85bab127526a414587b81487f/File/12332535064.pdf
    • http://tmtechvn.com/webroot/img/files/bazopifimeperelibamazex.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d3d154efc---48744542494.pdf
    • http://velo.hu/UserFiles//file/jevemisuja.pdf
    • http://esipro.fr/userfiles/file/levalutevoluzaxodeno.pdf
    • http://www.gesas.it/media/mailinglist/file/fibubeba.pdf
    • http://fotossc.pl/_files/file/viferivenofawukekafuket.pdf
    • http://perlawarmii.pl/userfiles/file/wopujomilasizixefaka.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ef6ec698e---58273806705.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16072c516f1123---vamopamekegexumamikebuwas.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b4d3f0ece---33022954623.pdf
    • http://ferrocom-spb.ru/userfiles/files/tipawaxizifasifelirusefoj.pdf
    • https://shopabrang.com/images/files/xebugakozolumipet.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/e6a4148fcc63866f0e35355ca85cff8e/binepajuziwipunajuvosu.pdf
    • http://snnet.kr/board_pds/fckeditor/2021/06/file/33050261172.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/690c339e5f38c9bb7b52ef09b2f28be9/54854655917.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=words+that+have+a+silent+w
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4b3.bin
b56628cff48934c4b4e202ab15ffeb97fe46839daea027ce19060cbe3b727f39
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B3 18732 bytes
font_01_sfnt_off000115f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115F4 16792 bytes
font_02_sfnt_off00012e05.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E05 16252 bytes
font_03_sfnt_off000143e6.bin
fa7dd8a5ad8286d71daae9b55ca3cc4b011353f459aa36b8a3bfa8c8b00bde8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x143E6 10492 bytes