Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a0871426ac3739…

MALICIOUS

PDF

75.9 KB Created: 2021-08-06 21:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e740f66eb5b822e4784372145c63f56f SHA-1: 603fd5745892f7263065aa2c302665ab97570eb9 SHA-256: 15a0871426ac37391ddfe28f3d978008fa1f305140664b6cae88ac9aff35760c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan. It functions as a link farm, with numerous URLs pointing to compromised CMS upload storage and disposable hosting, likely to distribute further malware or phish for credentials. The document body is unreadable, but the heuristics and URLs strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://haps.company/wp-content/plugins/super-forms/uploads/php/files/ltmnrmd6vuki9oh9lvonkgrhf2/tibofaxinewanebakuzito.pdf
    • https://allcreaturesinc.com/files/files/resibulawer.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16087999b93234---kokugemovumidegut.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/37a3c0bf08a558b6b71833eae5d33aea/85278541936.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9df047a1a---zobawolexemoserebuwefag.pdf
    • http://centrlita.ru/archive/image/file/88268575859.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/678171044ce5be54aeddb5c0870da06b/71739348905.pdf
    • https://southafricapools.com/contents//files/42219175543.pdf
    • http://fratellilongoni.com/userfiles/files/58373213499.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/a7qdl7chje4ponbshonkeffbkb/37732216008.pdf
    • https://trexanh.net/upload/files/talipapimap.pdf
    • http://k-souz.com/userfiles/file/tukeriterukomerepet.pdf
    • http://28777886.com/Lpf/UPFILE/userfiles/files/14516734525.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/639e44eb88b123089212620a71b392f1/30970611229.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/de4daa537aa1b3416ca04b2dae67be79/papolakurel.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/13hk5j6m5a6tlac5ki33breeh5/77122754413.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608658b6d7bad---57933499778.pdf
    • https://bandai-k.com/userfiles/file/dejupunegofoziru.pdf
    • https://polaria.cz/images/file/28330198986.pdf
    • http://ghibms.com/userfiles/files/xowugilakedaxego.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/d017409abc424626ed7668d055fa1f86/4433302177.pdf
    • http://podlahypilat.cz/admin/file/puvowufok.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade90ee5c0a---kagadufunijigesegonitenul.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d01df293a4f---tubupokifuput.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=kenmore+elite+sewing+machine+model+385+manual
    • 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_off0000c20b.bin
6da4530440c10c067c8a8a7758f309581b65db5d116e62d09db1465cddef4d1c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC20B 11508 bytes
font_01_sfnt_off0000dd02.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD02 16792 bytes
font_02_sfnt_off0000f514.bin
6c519a5c038e0ff951d6502ee2607c46e4b524d59ae78b197174dfc9494e5e4c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF514 16824 bytes