Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddae7f198d556d63…

MALICIOUS

PDF

89.6 KB Created: 2021-08-02 09:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8950574eada3f961ccee8a29e0dfa1e SHA-1: 0df9ab1414fe63fb2c50e1c2c1d540a5a0545bf1 SHA-256: ddae7f198d556d6320a4fad45d8aec235be918db1b279ae86f517db44c1f5135
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The embedded URLs are designed to appear as legitimate file downloads, likely to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://virus-safe-zone.com/ckupload/files/linuzanuvuxi.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/723243829.pdf
    • https://shopexpert.com/app/webroot/files/userfiles/files/72221531804.pdf
    • http://tencanpowder.com/d/files/timikiwuwebenofukot.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1e2c9fc44---2235418316.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4fb88a0c9d---zetozokomadesupafunon.pdf
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/ninilovavurokawunetanefe.pdf
    • http://melinterior.ru/userfiles/files/82989841258.pdf
    • http://alhouti.com/userfiles/file/81643693753.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/0592b7852f70de1f77a90f93820b708b/wesexedavaneborulezegilan.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/vnnl1d210e54ce6c38j8obn2v9/fupolasudujuluwim.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/77cd863aa5b939fb1630eb937745ae48/31383839366.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607929a4c4892---34909607017.pdf
    • https://mallncart.com/userfiles/files/76393006587.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/nrjl6s9dmgm79bln043t5glg35/87129512244.pdf
    • http://stasta.com/userfiles/file/23282683683.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81b960aa4---80211485183.pdf
    • https://serwisnawigacji.pl/userfiles/file/mijewobumu.pdf
    • http://hornets88.com/clients/56662/File/92270471710.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ae48af3d4---siponatixitodutemej.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a402a412e---paxapore.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a03ab06639e---ziwas.pdf
    • https://aashianarealty.com/file/9186908555.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607656cd5bd81---6613107897.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/alqopuqc83ktkjso7ui4o3j6dk/tuligikezosituvawipaxax.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+unfold+my+treadmill
    • 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_off0000f8be.bin
6ccdf6e0dbb5a35d8d5e16d8844c1c03377f8720d9b7b55b39d0d4c61a19802f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BE 17828 bytes
font_01_sfnt_off000127dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127DC 16792 bytes
font_02_sfnt_off00013ff3.bin
f6bf2d995baa6b931a40e94ad2bfb20677ad81e6c3657e42e3f416ae49fd15f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF3 10636 bytes