Malicious PDF — malware analysis report

Static analysis result for SHA-256 b485df5a7af2c1e2…

MALICIOUS

PDF

104.1 KB Created: 2021-10-26 06:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d409254d73d0a9d60235b7c6109ca9aa SHA-1: dd8cfc5747dc984bd3dbcfbf523b876cf4d15bed SHA-256: b485df5a7af2c1e223997eba0a057ae9b71cfb4e081d2570b419f7dd6e1f1f51
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, suggesting an attempt to lure users to external malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://flirtproducties.nl/ckfinder/userfiles/files/xafeba.pdf In PDF document text
    • http://ancient-theater.gr/media/file/92547646275.pdfIn PDF document text
    • https://themalc.org/files/file/27516027222.pdfIn PDF document text
    • https://cmoretv.com/userfiles/58307535469.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/60089626233.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/wukezojabirijekodaza.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/wosoruwupoxulanigov.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614574f57d763---82908912186.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/59709678190.pdfIn PDF document text
    • http://ud2-140.com/files/mevapafigewunexorijajik.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/fiwejezegematasasopugo.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/91754200572.pdfIn PDF document text
    • http://dhf-china.com/d/files/33266760147.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/rojifajixuduti.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/78266345456.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/pudizilonipuvogeg.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/10295867502.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/xizawidonider.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161390aad0dc64---dokobezifamebavepob.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360e65b242d---88700166053.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/63205411140.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20211007202514.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/tulalupe.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/63957217298.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-15/20210915142012372897.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/D9plVHj2VOU/uplcv?utm_term=subway+surfers+holiday+2012+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12175 18388 bytes
SHA-256: 8959e271a65829ff0e6cf1660d9bdb82bfc8034b475b1d39a4b289a1dab7480e
font_01_sfnt_off000151f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151F5 11160 bytes
SHA-256: f0132612ef7407a860d6ed404a4d03da5e6c471d04802de0cfc36fa0d9538f71
font_02_sfnt_off00016c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18425 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd