Malicious PDF — malware analysis report

Static analysis result for SHA-256 961eb5df4fb251db…

MALICIOUS

PDF

92.1 KB Created: 2021-09-21 15:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d10f59fd714dfd0aa7225ab2b32377bc SHA-1: 47598d3c75523ee835ccbf03c19f29822eaa4730 SHA-256: 961eb5df4fb251db04037e21ad932c2a07da14bfb34370edbb33d68de28a28a5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to various websites. Some of these URLs lead to compromised CMS upload directories or disposable hosting, indicating a likely attempt to lure users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://huseyindurmuslar.com/images_upload/files/24561953923.pdf
    • https://sfeerweter.nl/userfiles/files/21436270967.pdf
    • https://mabuksusu.com/contents/files/87817393299.pdf
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/bagobilinoxojotonaxole.pdf
    • http://cuboni.com/uploadfile/hong202109211500595287.pdf
    • http://xn--h1acbpobggs.xn--p1ai/data/files/gonidadonupemifonizopomip.pdf
    • https://techson-cctv.com/upload/file/87530878734.pdf
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/neguveniwubukavasituza.pdf
    • https://hchoanglong.vn/userfiles/file/98593389019.pdf
    • http://babyshelter.net/assets/upload/files/gazumivedalem.pdf
    • http://bluestandard.pl/ckfinder/userfiles/files/nixitulazuzomipiz.pdf
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/dupotolidoxevazono.pdf
    • https://floraplant.gr/FCKeditor/userimages/file/vewakurujofojebeloki.pdf
    • http://jenistudio.com/upload/FCK/file/ribagadavejaz.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/68651db7f5fc5ba0e7157e2c5c1c7bd4/43894768468.pdf
    • https://anukulagrotech.com/ci/userfiles/files/6550858460.pdf
    • http://parilka.by/var/upload/file/1600859715.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/qnsf3fflo68vu29q97uhnnpsg5/jobowowerufumelopujizekod.pdf
    • https://intekcanada.com/ckfinder/userfiles/files/jegavomazevawin.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/rkk3502gm64ghj691n0v62l8p2/kiraveke.pdf
    • http://ebrinteractive.com/userfiles/file/wexinaxagenonux.pdf
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/wesozis.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=what+is+the+largest+country+in+the+world+by+population
    • https://tes-sys.com/uploads/ckfinder/files/20210920/16321140351031.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_off00010192.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10192 16792 bytes
font_01_sfnt_off000119a9.bin
40ffcf532105f8badb6aec04a531f9d702b5441bbc0febe73548c23fbff051a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x119A9 11224 bytes
font_02_sfnt_off0001338e.bin
05f1bea32f841ff1031021eb42a248576d54c19ccd052a4365cb6d3c49bb95d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1338E 18100 bytes