Malicious PDF — malware analysis report

Static analysis result for SHA-256 d183c26a347f4587…

MALICIOUS

PDF

74.8 KB Created: 2021-09-07 17:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8d17a98eed899ca750a10b5e80aea8a SHA-1: fd0dad19fd0e9a3a740231e539247fa8c254a437 SHA-256: d183c26a347f458731ec18a31c42bc7e055b648c6f564dfda3b4b58d56c4bf07
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://philabc.ru/uplcv?utm_term=s%C3%A1ch+ichimoku+pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qeka2m701mmnmtm2vc0cam1v46/suxubakijopibo.pdf
    • http://robwalker.net/fckupload/file/lominikovevotimixe.pdf
    • https://cncunse.com/d/files/75680694734.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ff77bd3c8---93284382172.pdf
    • http://aaaexpressheating.com/userfiles/file/84823445307.pdf
    • https://feniks9.ru/ckfinder/userfiles/files/xefurubozefogapurogow.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aae8be59c4---41145703324.pdf
    • http://sieuthibds.net/images/files/jububamadetanufilesala.pdf
    • https://ismet.com.br/ckfinder/userfiles/files/75298629300.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081379242516---tunivemuzumakuseja.pdf
    • https://balarampurblock.in/ckfinder/userfiles/files/7210884144.pdf
    • http://phuongsen.com/img-chamthi/files/77107718206.pdf
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/59504905060.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/u2ti1q8dkahcqek6lbt4u6811b/37302245795.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611886315155c---8577971048.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608845de42978---fenuwoxilabegevero.pdf
    • http://tcurryproperties.com/konadnew/userfiles/file/kapofutotuzajuvow.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090b5ad3e97a---ganodolaxesozupilo.pdf
    • http://ahcxdq.com/uploads/file/120627544587.pdf
    • http://jrmhandling.nl/upload/file/miporusedinaxowipoto.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ema4a3gmvek2hhl18hcis9uk47/1442465893.pdf
    • http://inezorviskids.com/clients/37546/File/torapota.pdf
    • http://stihoplet.by/upload/editor/files/71066252151.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_off0000b906.bin
80e2dcfcb52c56038c8430fd94db80b8d20fc66cde2e2f370e6c0c2c616443d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xB906 20088 bytes
font_01_sfnt_off0000ec78.bin
319a6d3c7d23a78ec34c4360a1e4d22e80aecd6298f6e8787dfcc53c0e8f7e9f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC78 10524 bytes
font_02_sfnt_off00010471.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10471 16792 bytes