Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9fa3b1b219e739…

MALICIOUS

PDF

86.8 KB Created: 2021-07-05 08:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12356d3bb18d8ca76799aa8bbf48bd77 SHA-1: 1283a9d7ddf77f83a9798159816d3c74c1482b01 SHA-256: 8a9fa3b1b219e73960185cc410c3d92b0e43f680e010d969dc2c003862286e9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a phishing or malware distribution campaign.

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 https://infrive.ru/uplcv?utm_term=sodium+adduct+in+mass+spectrometry
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/0dc7d484d04e1b109a9259b04304379b/78860092570.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abec8f2cc1a---gawijenudakadumaxode.pdf
    • https://gikguamerica.com/userfiles/file/44505547829.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/4bbd7068da7ec6dc8d2d0128da140bd1/mumorojamapasevi.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160945dc60d66f---wotakegewekaki.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607933c00edd3---jibifazekewisego.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/2c7cb914388e3094ffbe0460940a1d62/betupujupinefoserokadix.pdf
    • http://scottsdalehighbeavers1978.com/clients/80197/File/mevex.pdf
    • http://vodnik48.ru/content/file/fewibafewugopum.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/6br1cb5rvq0ucq3punekgo0o45/givofiranuraken.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/b9e10124693ccd0c7206a8b463035a7c/85383027787.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/3ad85bfc611d372f6328e0c5c2c4cd14/gumiji.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d77f579f4---55312570421.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c0b3b8e29---13775980109.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/rkhmpdklkqfqau7rtsg918drt6/ditomuzebebugukenekoron.pdf
    • http://animalscipublisher.com/files/upfiles/file/femubemaxumufimexalafe.pdf
    • http://skrabl.pl/www/rpbd/fck/file/28253578807.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/0ced42aa3d6fe70d729e4caedfda144a/mevipirifuxunijakikiwu.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16086f734c901a---32019668232.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/5e842b4216dbd4cd90fa335112e1c733/kikelenizewer.pdf
    • https://angelsstaff.com/uploads/file/28442652790.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607eccf77b4a3---nenodu.pdf
    • http://bonfiremadigan.com/uploads/fckeditor/file/metuvumus.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a876a1f3c---rijawosozinufuneliriz.pdf
    • http://grandinhr.eu/images/user/file/bujirosinoxitodevu.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_off0000f103.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF103 16792 bytes
font_01_sfnt_off0001091a.bin
0ce77695810e0054107458e87d59b1371c5e00a316734830a7d6a549892a6a1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1091A 10916 bytes
font_02_sfnt_off00012262.bin
8a32e1a2c5293732441378bca4d0fa5aa8e91e5c846f3a39d466e53556f10550		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12262 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.