Malicious PDF — malware analysis report

Static analysis result for SHA-256 672dd3ab7a57ff9b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 22:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05f0dfdd4752ce3d14f0be0484179b66 SHA-1: 7926bc23423dfb6f8e7b8fe6438a49f38ab9625a SHA-256: 672dd3ab7a57ff9bd749337d77df99cd9a6e461314e21ecb8c6ea818a1025ac3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document impersonates a cloud document lure, a common tactic for phishing or malware distribution. It contains numerous links to external PDF files hosted on various websites, many of which appear to be compromised or disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857ba83fc53---42854785807.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/3c0c14db91161317994c5af73134618a/87003040217.pdf
    • http://flatadministration.com/uploades/fckeditorfile/67161150049.pdf
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/xifitasaba.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/a04751f195d260838783f82b1faf6115/55297085059.pdf
    • https://ehlibeytalimleri.com/resimler/files/51546805555.pdf
    • http://parkergeneralcontractors.net/userfiles/file/suboxuparatagi.pdf
    • https://anduong-nhatthanh.com/uploads/news_file/pugofanevimijoj.pdf
    • http://busangh.com/attfile/fckimg/file///20210614174839_927683052.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/alebe2s1fin1le00g8hm4qovbk/90345055878.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d007432f60---46562995825.pdf
    • http://chineseclothingonline.net/File/47311671898.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161323e6c44e95---mosefapimujijutuvo.pdf
    • http://dalaichau.com/files/75103353221.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/u26hlgnubb9niqrgjhjiub9et2/pokuwiritodavogaxi.pdf
    • http://liyangah.com/Upload/file/komasawusa.pdf
    • https://angkalaris.com/contents/files/godalub.pdf
    • http://atek-ent.com/upload/file/topejuzidi.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/12ec1efa9e67c9ce475bd0c7294b9111/62040034561.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607098b35ab8d---tatawixebubepuvut.pdf
    • https://livnica-metalurg.com/images/pages/file/mufosejuropiridejamumu.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/f8d2a632d08a0a9ce7c2ce2c735b1aa4/kubavavetili.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a295a93687---pixivakasefow.pdf
    • https://aydin-elektrik.com/resimler/files/jolerebadazuzure.pdf
    • https://scalper.ir/data/files/file/12443074363.pdf
    • http://fixafilm.se/userfiles/file/mebebejasosem.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/1d0aaef76d5984eebafe813716d4cd91/53322497047.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=adobe+reader+vs+foxit+phantompdf
    • 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_off0000d8ac.bin
39f7ede19e19cd8ec2f92b3a4160d56353eac6c5c01a1b0825bf3a64a72f8018
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AC 17844 bytes
font_01_sfnt_off00010707.bin
bc77fc890e45cd4ef53db41139e03b283cdc3757f8a5be704ac1f0190962870b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10707 11004 bytes
font_02_sfnt_off0001203d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1203D 16792 bytes