Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f7af55a701aee58…

MALICIOUS

PDF

97.4 KB Created: 2021-07-13 01:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3058ed8c4ef329f96ab8427e5b89fadc SHA-1: e5cadce0f96a886859bec8d3c1cc04d86fc68687 SHA-256: 4f7af55a701aee5808cfe60c7b633fe14ed6321b58108ec35390979bd4ea246e
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to lead users to malicious content. The presence of multiple distinct hosts and a UTM term redirector further supports the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fad750372---44208720728.pdf
    • http://mistral-paints.cz/userfiles/files/84861983767.pdf
    • http://sportgalaktik.sk/userfiles/file/tiwopawaj.pdf
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/87569960445.pdf
    • http://freeski.hu/freeski/file/35561447134.pdf
    • http://xlsferrosilicon.com/d/files/16472798549.pdf
    • http://mirutte.com/newsfiles/files/fuvutajobuzoduxake.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/rmrsjiek8i5fnb6fmfkh5pke94/lamofojawu.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/7be3616f7ea9f6e946df519e8055ff3a/vototibolo.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e9ca13b37---73279160665.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608971ed8b1de---lafalenoleroxixopidij.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/bapukarazunugogifafip.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609eedcc67536---36456712594.pdf
    • http://aftckwt.com/uploads/file/sofiximoj.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab3d1dba48---64511083276.pdf
    • http://df-2.de/images/daten/file/72236963255.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868781ebb95---97408771061.pdf
    • http://ongnuocdenhat.com/upload/files/mitumolalizotebukokujekod.pdf
    • http://goteneplast.se/files/images/file/buzolileginij.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e69ad5bff---kopojajepekuwoti.pdf
    • https://cmetrix.net/ckfinder/userfiles/files/44036165412.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c13955e371---xezuzotim.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=words+that+rhyme+with+pretty
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4a4.bin
7d1886901208935e98df3e7566a2a61798b24db681f6a408f044a4aea1d7b61e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A4 10700 bytes
font_01_sfnt_off00010d4d.bin
b9b9e22d933887b1583aa9d693a0ad5443785a7e3f2a3a2d3e90351b8aea6829
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4D 19320 bytes
font_02_sfnt_off0001408f.bin
b818e08caa02e65204dbfa3b779ade9aa75dea75b4b35e0ae513425f78de0ec2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1408F 1712 bytes
font_03_sfnt_off000148ab.bin
1b49b3b3e316163df5ab95e533551f6a01f90185c214fc5e7e33f68dd86219d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x148AB 16408 bytes
font_04_sfnt_off00015f47.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F47 16792 bytes