Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e876f6f0a9025e5…

MALICIOUS

PDF

71.6 KB Created: 2021-09-19 10:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64c4db13991c5e8b568415b05b3bc6cf SHA-1: a10f0861e3ee1e7d374163ba269394bccc4f7d34 SHA-256: 8e876f6f0a9025e58a7aaff39654d6db3b1406b6462a1676b2a78f8ef5e8b270
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 compromised WordPress upload directories. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e78dea4589---kudisenekumeda.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/9bc7d40f8095316ce8cc89be47698fed/23882608153.pdf
    • http://mstreatmentadvances.com/userfiles/files/75218014019.pdf
    • http://mtsp.by/userfiles/files/10889843207.pdf
    • https://portalbime.com/UploadedFiles/New/file/zuretapijisufejonude.pdf
    • http://thewesternmist.com/userfiles/file/wabunijipanelew.pdf
    • https://asiantms.com/ckfinder/userfiles/files/58394387330.pdf
    • http://solo-reisen.com/media/images/file/xudel.pdf
    • http://stagelight.pl/userfiles/files/vozusurus.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614693eb03e57---rikutefitavurowububixos.pdf
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/22858063425.pdf
    • http://kovospm.cz/fotky/file/paxumaki.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/c4c10cadb8f3e597082454eb148737dc/majenujiwekelujo.pdf
    • https://privatecambodiatour.com/userfiles/file/93174472222.pdf
    • http://speaklifeiamgreatness.com/files/files/nebodojeluzexevagoropojob.pdf
    • https://cartolmania.it/file/63515180809.pdf
    • http://barefoot.pl/userfiles/file/paxalizupanuzuwejisipana.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7ee8ae528---teronebosigunepa.pdf
    • http://frangarcia.eu/upload/file/padogujo.pdf
    • http://systemsbiology.at/uploads/assets/file/86218591449.pdf
    • https://maggievanostrand.com/uploads/media/file/54964433995.pdf
    • https://www.sacict.or.th/ckfinder/userfiles/files/fubamolizesotiv.pdf
    • http://traviet36.com/upload/files/50087686064.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cheat+dls+2021
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/dupowujakabobonid.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_off0000b8e2.bin
4056384ec80ebcfed9266e1a233a667ca0a818b4e8502a2b4b01f85aeb47319a
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E2 16068 bytes
font_01_sfnt_off0000e223.bin
2cca29f0806faf4ba415b00fd0307f65ad55bad29a529ed0af0a926819a8509c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE223 10252 bytes
font_02_sfnt_off0000f980.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF980 16792 bytes