Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a1271b0347dc120…

MALICIOUS

PDF

84.9 KB Created: 2021-10-11 01:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 95bb1a44fa1cdddd9e80d842219642a0 SHA-1: 528e18318506de967c0f88fc8c35199a5db49ebc SHA-256: 2a1271b0347dc1206b72a8b644051fa7e3d190f1202d34820c03b8d03f19b168
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/546a55cc666f68ff48a48dcab7165880/68746045732.pdf In PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/5bel47ibb4lh2pn52agu1153ls/wemekagimajituwe.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/fexukexi.pdfIn PDF document text
    • http://4bx.pl/public/file/gupusirepuru.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ffa849e4c0793f59637b0abfc4ce56f0/42840106302.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/94220204067.pdfIn PDF document text
    • https://norservis.com/files/files/28967652275.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/92226039029.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/kafugebavezofifi.pdfIn PDF document text
    • https://taumed.kz/upload/2021/10files/211006103427010063ypyps.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/60494000164.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/13738855698.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/kabujenorapajukeditobisip.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/kilapefosugijafal.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/25677912688.pdfIn PDF document text
    • http://goldmustang.ru/files/files/2267797339.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/33804064561.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/sajixisutaw.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/a40e0bb7bf60a539d70bbd170ffea17a/30090517674.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/rinexajudalobuwu.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/d67619be59e77c24cd0134dfd16c1d4d/92791415665.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210927223530.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/gawiragowevobugegotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=heroes+of+olympus+pregnant+fanfictionPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 20184 bytes
SHA-256: 0f3d30583aa70efc28ced8740620483e02919180d1afae86c354576e6c8000c3
font_02_sfnt_off00012a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8A 11028 bytes
SHA-256: 2c56a94deece0bae6dc8e88e90718c9539f3ff8a5f59b7b4bc8c45c49ef36c44