Malicious PDF — malware analysis report

Static analysis result for SHA-256 033725d939119258…

MALICIOUS

PDF

96.7 KB Created: 2021-06-25 22:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d86dd1fa71eea2871a8838a999447155 SHA-1: 102a3f74797ec6afa03527b92c19a62c043d3089 SHA-256: 033725d9391192588ff24e8f6e4ce041dfc178329031fa9f9f52f586ae39d83d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 https://fallsplat.se/file/52510424619.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607696f54c6e9---68175323263.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbfd2d7638---kogupi.pdf
    • https://alshaabcoop.com/userfiles/file/56843263297.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792537601cf---naxix.pdf
    • http://lyzebrno.cz/userfiles/file/13211179442.pdf
    • http://maychamsocda.vn/images/userfiles/file/85820674099.pdf
    • http://atmaircenter.com/lb/userfiles/files/feterodiximufegixab.pdf
    • https://alakharia.com/public_html/userfiles/file/najotavuwup.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/q354iko3u3pketveeii8hg6sep/wazevisexuridi.pdf
    • http://st-ark.it/userfiles/files/60787234119.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/283a998ba5a1610e9f8bc240fd0048c3/75102944277.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/c220c485ba20d3bc4c8a0f88dc70a3e9/jewos.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/hdh6bfarl6rhmpoi66kj7cfpq3/sizexatemadej.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/344f8d4004c7ec0d432019b63b12929e/20536453354.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/fb26c14a849306db8560e040faad30c4/nafowojirugelo.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072d7a72d82e---86011992279.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16082919474aff---36647284469.pdf
    • http://pwr-tech.ru/userfiles/file/kubijuzajimerikadasas.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc8dc090ab---rinetikedipesafunazozit.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/57b0jgm0aedph450a5kmrirnn1/58914951078.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d382304fad---23858275434.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/d7dda7486d93e5e922f49fec1efaa4b7/zizavoser.pdf
    • http://barudan.hk/UploadFile/file/20210607042648305.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+area+of+an+equilateral+triangle+with+side+2+root+3+centimetre+is
    • 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_off00010ee0.bin
c04c0bbbebe1567fba17a6b7fd108c775f71e74ea97594f3a51a71b73a18fa27
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE0 11508 bytes
font_01_sfnt_off00012996.bin
baa73a435b61d060fbfc630bc3efd943fe9de619d69ad829bfab1041c1658e0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12996 19596 bytes
font_02_sfnt_off00015cf9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15CF9 16792 bytes