Malicious PDF — malware analysis report

Static analysis result for SHA-256 f547ba9f2a3f38af…

MALICIOUS

PDF

87.8 KB Created: 2021-07-20 19:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0426e56bb52eb2caed251d7e1e26cc2d SHA-1: 93a5f444acee7802a77f0803f5bfecf7fbf4a119 SHA-256: f547ba9f2a3f38af8445b288500639ff4f6c0e174b1c09ff3b87120e6887f2a3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these external links. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://ambulanceservice.pl/userfiles/file/84761198259.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783de609ed5---71588053243.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b22ff839af---sorirasirer.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/8b8158a054d3f8967766a710b7f2c706/mevevelixamevalomiseg.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/e65o543vi8ai5jrhk7iniea2s7/27002776233.pdf
    • http://nw-line.ru/generic/uploaded/datobamomatude.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb868312a3---pozipusevefiko.pdf
    • https://service-panev.com/userfiles/30783153978.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c230b4753---fupakupotovusebesa.pdf
    • https://bnbcostaverde.it/userfiles/file/90031727640.pdf
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210704_429B0CC0E9EE0DD9.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cca9b6578---5598325841.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/e8283a9e9885b950f2549c857fa5ca4e/64390884678.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/5aa53751d70bdb993dc30224ced7f6db/bigilugi.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e694ece8d---dagogududobejivan.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160860af9400da---lijonakumegositovomoweki.pdf
    • https://festival.bg/fckeditorfiles/file/xetavudilufazigukuvadotud.pdf
    • https://vieclamday.com/userfiles/file/jazodigogulixebizog.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608427684bdde---lesoxawigizogulegifizubu.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160781a53eb5b2---73548961750.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21d6c7711f---vodok.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10f432350b---nanemijakapa.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c6918d266---72885230088.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=notepad+find+and+replace+new+line
    • http://e1pl2.nazwa.pl/busy/fotki/file/medemasaf.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9d4.bin
173e954ecd0cb983a8ad1abb5d2e94c74203e94623c68793d355c1534d3efaa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D4 17188 bytes
font_01_sfnt_off0001173f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1173F 16792 bytes
font_02_sfnt_off00012f56.bin
b1a6603a683a875f983e3d264fa5c777b4c681150784c98dede7a3a148f7443c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F56 10508 bytes
font_03_sfnt_off00014756.bin
9c3c50ca7885eb1b87261f6f74ba185aca171ae216209544253fbc3ee3acc073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14756 1720 bytes

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