Malicious PDF — malware analysis report

Static analysis result for SHA-256 c19a58049a08400e…

MALICIOUS

PDF

86.9 KB Created: 2021-07-08 02:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b69387724cfa665d6f8ea560c16ee752 SHA-1: d6733f3fd7bde70b40ca88c3535238428af6ce99 SHA-256: c19a58049a08400ef010e50aac7ad08aa4bff672f936e029e04d26b26db03968
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of the 'utm_term' parameter in one URL indicates a potential phishing or SEO manipulation attempt. ClamAV and ML classifiers confirm the malicious nature of the PDF, likely serving as a lure for further malicious activity.

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://oniceh.ru/uplcv?utm_term=among+us+download+for+mac+free
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/kiwubiripevupupe.pdf
    • http://csc-0898.com/userfiles/file/20210611082332_2ot381.pdf
    • http://maybaobidinhdinh.com/upload/files/futuwaporovigek.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/73p7dubtb3a8rb42pf333ssiu7/56278391841.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/ee69106a52047558296faa0ec450bcd9/91511491203.pdf
    • http://allaboutdowney.com/userimages/9797675008.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16071f22cbfce9---80968821629.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd5651c89d---69875261167.pdf
    • https://hogies.com/includes/template/uploads/file/razererepenemogelijokak.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/m0dlei21e29hm8e4tkl8ctu4s1/gazonufug.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1d8be515b---83726232193.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/78233986789.pdf
    • http://ipceurope.eu/assets/file/2066850126.pdf
    • http://classicalgardenornaments.com/uplds/file/gilade.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/3l8giru1m4dmo9g30k8lbdcl00/malusekoniwozeresit.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/lmr4vrfe006a2dqakpurnqt74f/25973985708.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1a1373101---nitesalapakewakigodoris.pdf
    • https://fokusmedia.com/images/uploads/25240013697.pdf
    • http://eviljoy.com/UserFiles/File/dipinixezexisoviwibo.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098540dded0c---kaxorigu.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/4390b57a1d9400e472a5725d32eca56e/mewesakowizarifujenepa.pdf
    • https://dgaspcsm.ro/ckfinder/userfiles/files/zulanenumaduponobuvanu.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8047ed834---18633694073.pdf
    • http://www.multigacos.com/admin/uploaded/fck/file/31000739807.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/2vvqiom03lin45k6ivbpg10rp0/99552897.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_off0000f0db.bin
beeffee432368036c9d05a55569a411c75f4fdd4f2f590907c6dc2077c77aa17
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DB 17116 bytes
font_01_sfnt_off00011d6a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6A 16792 bytes
font_02_sfnt_off00013581.bin
415c117d47a043f315d499104dc131ac8355f07e554c5daf90956344728bf752
pdf-font-stream PDF embedded font (sfnt) at offset 0x13581 10796 bytes