Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f60146acf5c020d…

MALICIOUS

PDF

87.3 KB Created: 2021-08-05 07:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d4ec292cbfc16b70e2d4faf1a78b8e2 SHA-1: 54dbae7423d76bf8d197c84eda740dffafea00b0 SHA-256: 1f60146acf5c020d1210e5b611a153a7866a6f8862a5a5bf1ec13295ae12badc
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://crewmak.ru/uplcv?utm_term=himnario+adventista+nuevo+actualizado+para+descargar
    • http://cokhibaosang.com/media/ftp/file/98954380451.pdf
    • http://101eyewear.com/luutru/files/93767478370.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160797915303cf---bigaw.pdf
    • https://llsindia.in/FCKeditor/file/4718107324.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16094667f45cb0---81464405147.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/6dd4742ff6d4e654de05457cec15506b/746198493.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbc1ea9c0d---83366650324.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/grbgrlo2dj4rlleejoivd6k63v/65903999742.pdf
    • http://nhhs78.org/clients/63854/File/59918971820.pdf
    • http://trunghungplastic.com/luutru/files/86833400504.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16083f2cd7371a---nigur.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/47da9ac2e0b60be5acb0592c20997a21/14747378766.pdf
    • http://boschvietnam.vn/files/usersfiles/files/75125316679.pdf
    • http://dietetyka-24.pl/images/files/5395360908.pdf
    • https://priscar.com/documents/files/48271193243.pdf
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210803205924.pdf
    • http://hzzxtl.com/UploadFile/file/20210728062328198.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075b68b32865---23775558333.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/f1a809b41f1b7421689ca2a2887373fc/miwosokupitukifupusixijab.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/tjm1ion9dna08at9gm9r5lnp72/81891530168.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/8642855c0ab3ba305d66f5ca718f56a6/64849648403.pdf
    • http://bbpcosmetics.com/admin/upFiles/2021-7/file/9637242334.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/c7cc54eafefdbcd7d60c5887b33d7b73/99359844266.pdf
    • http://alwaditrading.com/userfiles/files/bafijesewelewobigimib.pdf
    • http://puginternational.com/ckfinder/userfiles/files/selenatuwuzimuwegevuza.pdf
    • https://aiwatopup.com/ckfinder/userfiles/files/resotawenobaxakugo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb91.bin
13943d9a7e09be47aafab76694e69cab3718a6b60db80c91aed58306991bc866
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB91 11076 bytes
font_01_sfnt_off00010522.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10522 16792 bytes
font_02_sfnt_off00011d34.bin
0c32f23ed2c464bc34cf30e6d9173179f0a7e4a0ee3e0b81d9282d1e95122b7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D34 18460 bytes