Malicious PDF — malware analysis report

Static analysis result for SHA-256 66919a4380f8a589…

MALICIOUS

PDF

89.3 KB Created: 2021-07-04 15:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6bd21e3360fa59a73ccdd0940798f8cc SHA-1: 1bf9ea08f8993bfd5d2dfc459fa88c290c75308f SHA-256: 66919a4380f8a589985266a477ac0fd40aa75bb3ef4d97dd9e3e0cfc1bdc775b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URI patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf10306365---zazodedisodef.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/30614a79c25f347ba64c13483f88a433/fixobiminegowowewukak.pdf
    • http://red-persimmons.com/upfiles/editor/files/43008285281.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e0c4f4b6ee7---54305617296.pdf
    • https://audreyheselmans.com/_files/file/vobubimamu.pdf
    • http://sacoorhealth.pt/site/upload/file/18584847129.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/26f7670edac825a2c0986f47952967a4/78592948327.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/8d6ac7e0f130c57c18f94276241b4a00/vilarovafazosiwilixalu.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080b58e7cff8---puzik.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/v4mtp3cksfja0mel8f2jd7hld0/40679751481.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/th3fm4e045jiaofj2esd8asi17/pebilumofovukowolizi.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/t8mkm979e4l3t6dbs1m0h6heec/49690424291.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/lc8fqn5804di1scsmh18s828tv/1726119460.pdf
    • https://marjoyunlar.com/calisma2/files/uploads/rutesesevisuwusepe.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607dafdaa83ce---fuxikeneg.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a71ce28351c---60389335370.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/af98dfa2d305903fbbb8dc3ce115ae7b/43554515178.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/255b90272bef2aac2a48782ccc9b16f7/2059353882.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/070512bf8c69e5eedbed1d6f53a69ea9/jujegesabumumekivido.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160976ead23193---sazilu.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ca2106a8e---fakadekoxebelolodo.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3c9015839---61463114497.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f29f484044---dugemizalawesak.pdf
    • http://sva-jeanroze.com/xmedia/file/60660327137.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/cea4f8f295bc03412a266bd2b0ecdee8/xomimi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=old+fashioned+twin+names
    • 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_off0000fbe6.bin
e37d5d566bbc531f919b4e345b5b54f4f532f91d8452ae1aea73369b2635c859
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE6 16924 bytes
font_01_sfnt_off000127dc.bin
59bcad23ea0ba2a515b649e274456bac1e7fead426b9ec15c885c1a11ede9550
pdf-font-stream PDF embedded font (sfnt) at offset 0x127DC 10632 bytes
font_02_sfnt_off0001400a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1400A 16792 bytes