Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7eac91c4fce4ad…

MALICIOUS

PDF

90.3 KB Created: 2021-07-28 06:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69274d5cc9b59730d4dea712ac99e6f4 SHA-1: 8ed894d4efc5e33a49399332a96f906fa637d72c SHA-256: 4c7eac91c4fce4adf67ea96194810b839539d79257510e18395c0b6028a3f0d4
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. The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm for SEO manipulation or to distribute further payloads. No scripts were extracted, but the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://maszyny.pl/userfiles/file/45205015108.pdf
    • http://airconbank.com/upload/fckeditor/file/vemuziligorogezagewimexol.pdf
    • https://bestofbucerias.com/upload/file/matedesafupatipekaso.pdf
    • http://alphasigmaoverseas.com/userfiles/file/57192209450.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160823dc742fae---48431476985.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/86f6b13bec6da1ea701f50f4d621b281/3495418709.pdf
    • http://phatnang.com/media/ftp/file/54690975495.pdf
    • http://a-swiss.com/upload/userfiles/file/zolodijimijuzatezuj.pdf
    • http://vmkmsz.hu/userfiles/file/44015075904.pdf
    • http://viethanit.vn/hinhanh/file/xegobosoxusewoporupikixov.pdf
    • http://lamachine.nl/userfiles/file/8710463834.pdf
    • http://renovator.cz/files/file/lejidejagi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db30ad8e8e---24443133118.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b2de80166---gofitalisewajid.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/89el6iah3hdf7el6hh8aq8sab7/23143852567.pdf
    • http://dochoiotovn.com/uploads/userfiles/file/tipiveremimorowomez.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e755925f5c---jizazatenojutoxuvewewe.pdf
    • http://asianmosaicnyc.com/userfiles/file/vasonurusojezujedoz.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/r676a9g3vkf60r2skv7gljtfd0/2055159539.pdf
    • https://allcreaturesinc.com/files/files/26996561026.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160aee4463ef82---70657868471.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5bf23236c---desagerovov.pdf
    • https://bestrecycledautoparts.net/images_i/file/gitisigidinipin.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/7gku7c0vhbcah570i2degr7n6a/42796956980.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/1072a402c343ff0e4f2ecf6c59138fad/judenaxoxoxerekuzegudutik.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/67759371890.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+use+conair+garment+steamer
    • 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_off0000fd62.bin
18bf3d0defc73ab3abc43a9c60daf5d76aba216732b33509d8dc5c8b50c78a22
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD62 16928 bytes
font_01_sfnt_off00012997.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12997 16792 bytes
font_02_sfnt_off000141ae.bin
95ce9e7cd1d5a22f2f2f5a83ac25a5c2795af107c9aad0a3ae993694a3a64d85
pdf-font-stream PDF embedded font (sfnt) at offset 0x141AE 10704 bytes