Malicious PDF — malware analysis report

Static analysis result for SHA-256 f703f12e88934015…

MALICIOUS

PDF

88.9 KB Created: 2021-07-04 00:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d0a6b8d7e8fc812d26566c753232464 SHA-1: 012d31f63c59e5a23a6fb96ca69543c78a85caee SHA-256: f703f12e8893401583860d6ba6f0908774e31c8d73a07d336cbad0c40abe4486
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the heuristic findings and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16074f9f185bfb---lakirarowarelesixu.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/b9085f2804d3e3bba57b42c33289cb65/85938266814.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ud14h27ar3gbaf1cpkejn1lvl0/5817847600.pdf
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/b593dd7f29bcef170fd200d9eb67db77/putugevigidemapuf.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/8j61hc431ttakegbfg56dticsf/53821266702.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/5r6afr01kulcfid9et49fqt1j8/11007425638.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073654d42a16---boximeromipagi.pdf
    • https://oteaexpert.fr/cite_imgs/file/27722482616.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/73bb9e506f51f9d1b1406d73461932f7/69045631711.pdf
    • http://stonebreaker.at/31786099452.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/bh627j42hkqtcnn3dsvhknjse9/mezusepijuzezudutoxofaxub.pdf
    • http://jp-photo.cz/soubory/files/fawijupapexemepe.pdf
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210619_84A35D722163B8BC.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/89ff7f9a465e21fa3856c7d0c2ab5dac/8088785248.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/c1b33721ec7f662fb4bd86ee9e1a86b8/84820913451.pdf
    • http://arniestribu.com/campannas/file/63387475001.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/9gth0pgim82c9t9oiei03e3gu2/tuneperilanunagimanerap.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc8538ca03---47095458010.pdf
    • http://timeyear-v.com/userfiles/file/71849399449.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/r1hmbjid84qnge6vp6ardi98o3/tujabugabosezalopinumep.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c23db5970---36311292580.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160743d6c156df---19480256343.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16070ef1fdc5e5---xonokasuwizi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=feasibility+stage+in+construction
    • 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_off0000f9e9.bin
8d06bff32eaa24aff5d2121992ab59e812fb5b2a849291da7e56028fecae331a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 10736 bytes
font_01_sfnt_off000112c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x112C2 16792 bytes
font_02_sfnt_off00012ad4.bin
e25c4a6075a8ad611218fca8585addce9f5d2890bb9bbb579a861244c732188d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD4 16808 bytes