Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db1ba2be150b337…

MALICIOUS

PDF

74.3 KB Created: 2021-09-12 13:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 254b0c2bd8d0e2ba97adb93c924b66fe SHA-1: 9017549f0e851c585854d6bdc88b023abd8b22e8 SHA-256: 3db1ba2be150b337cfc68752a109d2ee1e89c8e061131a36296c3da58f81487d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. These elements suggest the PDF is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=cheat+gta+liberty+city+stories+android
    • http://e-skala.pl/userfiles/file/11904105080.pdf
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/69592271412.pdf
    • http://dokumsuzgec.com/userfiles/files/640703042.pdf
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/zizigebavumogatejumu.pdf
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/69843268788.pdf
    • http://analhospital.net/file/files/82352926720.pdf
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/10417151689.pdf
    • https://polandpools.com/contents/files/gixufirejusekajez.pdf
    • http://unsersohn.ch/images/file/wipawuzipesaxeligepaz.pdf
    • https://spheresignal.com/app/webroot/userfiles/files/ligasewenofidisew.pdf
    • http://tcsklife.com/filespath/files/20210912155321.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161352c87e7ff3---48115764574.pdf
    • http://dorrstrechy.cz/UserFiles/File/lobipuz.pdf
    • http://zeminyerkaplama.com/upload/ckfinder/files/58698989158.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/2ebc998619655a206eb710cd4486936e/84792277516.pdf
    • http://mgrima.com/files/file/nazuwodedojegemeti.pdf
    • http://bukharaatlanta.com/sites/default/files/file/21557910084.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6234a9c6add1bf5c394157279d63605f/gakediwuwirufef.pdf
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/90175964219.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce50d96766---maxuwiwatusetemeduze.pdf
    • http://austral-immo.com/userfiles/files/10688868780.pdf
    • http://longchimvac.net/app/webroot/uploads/files/95823825672.pdf
    • https://kisikana.hr/UserFiles/files/masovamelujod.pdf
    • https://holycrosshealthcare.com/userfiles/files/22082516469.pdf
    • http://gilendor.cz/userfiles/file/59138532850.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_off0000c085.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC085 16792 bytes
font_01_sfnt_off0000d89c.bin
0e08f5c3e5a21b618998b233d371c41b4baf62dedc93021ad45699e8c1451838
pdf-font-stream PDF embedded font (sfnt) at offset 0xD89C 10936 bytes
font_02_sfnt_off0000f1bb.bin
36e9cd07fcdb19b207503febf05d6955c8dc225ced5acf1ff2c9bb805da0d1bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BB 16252 bytes