Malicious PDF — malware analysis report

Static analysis result for SHA-256 95b7fde67a490512…

MALICIOUS

PDF

87.0 KB Created: 2021-07-30 18:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5dfaa4aed5e2919193cf6ace0b71ad48 SHA-1: 1aed89697905e1c07b91f9da112a28404774047c SHA-256: 95b7fde67a4905125bf0f808ddf448b9741f577cc675ea4d4e98cbf1a32e9f34
164 Risk Score

Malware Insights

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

The sample was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to lure users to malicious sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/c8bec56de873861d76e30d70d59e283a/sawuw.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c886e07335---93049530391.pdf
    • https://classconnbio.com/img-jacson/files/taxilux.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/dd7kgkp7l2eiae6qadtvidsr6p/17827573491.pdf
    • http://ggmtc.net/userfiles/files/vimuxanagem.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b468796e1---24931337679.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2cad25966---6146412461.pdf
    • http://temple.mo/userfiles/file/5045866950.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608289962f051---fuxidekafujuseriluja.pdf
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/38136896032.pdf
    • http://sghr.ca/upload/ckfinder/files/xufugogikise.pdf
    • http://igigeothermal.jp/userfiles/file/kozejakinek.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072adb9e627a---33009517115.pdf
    • http://akinmedical.com/uploads/file/vobuwiwebojazumubo.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/370435a2272617c2386dc0b18243670c/36977632817.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/5f92d83642ce0492231c128f1b6dd2a0/rutir.pdf
    • http://lamachine.nl/userfiles/file/52172838282.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/74sfhhpb8bssh8q6a4tvpdhjeb/mawugoterod.pdf
    • https://maggies-handmade.com/UserFiles/files/76190482055.pdf
    • http://deauville.ru/files/file/29026359211.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/9f119cface15cec274efec3868da1cfd/latavikujebubatomegu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+does+a+flush+work+in+cribbage
    • 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_off0000f01c.bin
0a81342ed66cf17a10793be30bc8e446ccf3f982fa3760a677cb674a6341a9c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 17036 bytes
font_01_sfnt_off00011c26.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C26 16792 bytes
font_02_sfnt_off0001343d.bin
1189e0ad7874265ab1feca42816979109f72257db0dc2eade071e0a784e9b127
pdf-font-stream PDF embedded font (sfnt) at offset 0x1343D 11068 bytes