Malicious PDF — malware analysis report

Static analysis result for SHA-256 733ef789138aadef…

MALICIOUS

PDF

85.7 KB Created: 2021-07-02 02:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80d5032b5ebd6655a711c66f4c453f0d SHA-1: 5c85f7cf1f99a25dd26f7b54300e4cbc8dbbf194 SHA-256: 733ef789138aadef321b681eb8be60d969c6b438f9193b601b98eef03b904c54
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or phishing sites. The document body was unreadable, but the heuristic findings strongly suggest a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dallapietamarchisio.it/userfiles/files/72555329289.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ed944c15f---wiwumuvakibedodigito.pdf
    • https://contact-house.com/fckeditor/upload/file/90035949836.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3f169e2da---zodelevebif.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/4ca53fd041f8738bb1f1a82a390c2778/gutafetokudisuvesewovidod.pdf
    • http://bukharageorgia.com/sites/default/files/file/24540078722.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/6bbd1bef1c13ca4e108e1c38a317a962/jupaziziwukakokufumexobeb.pdf
    • http://duetsepolno.pl/userfiles/file/zilezodovibevukugawe.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd229e94321---refojimovaxa.pdf
    • http://dansecyr.ca/pdf/file/90819508724.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160baf5a91d910---716464128.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4a6e182fb---46478668813.pdf
    • http://daoltrading.com/userData/board/file/tujuketoxitux.pdf
    • http://446888.top/userfiles/file/15820681292.pdf
    • http://rheinmotel.com/userfiles/file/sazirutezipijelav.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607a91ebc2764---nemasurova.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/nvrq96tp4lii579i9hnrrl6s1n/zunimubufa.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097cc83a38f3---19916120430.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/4e7560ec23390b3b1eec6346d7cc804e/9461851791.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+take+diane+pills+for+the+first+time+tagalog
    • 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_off0000eada.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEADA 16792 bytes
font_01_sfnt_off000102ec.bin
416e97343b7cecc024aae7f15f28470f2a1fe4905c69a2f611ba20ab3f546ac9
pdf-font-stream PDF embedded font (sfnt) at offset 0x102EC 17248 bytes
font_02_sfnt_off00012ff5.bin
39a1d880762507f71af030f5b5aa193a87a458e6378c9a3ca4b2205f3d8b5ae5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF5 11116 bytes