Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0ae84dbe03bc77f…

MALICIOUS

PDF

101.9 KB Created: 2021-06-29 15:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ea044b77782c03fa270336f51ad7ab3 SHA-1: cf4d4988b68fcaea17afec9b0d9c01eed2e42bc4 SHA-256: d0ae84dbe03bc77f410eeee509737dde3eab776738ae319ac9dcb34e36d56137
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, forming a link farm. The document body is unreadable, but the presence of a link farm suggests an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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 https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754bd4195b0---73736776325.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d2413f7404d---533392663.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/1rbc0jor0gue7fl2fngt5qgc24/60553651081.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/99212170854.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/6ca65e46e8e67abf12115b3728090d74/5600570513.pdf
    • https://daxitrip.com/basefile/daxitripcom/files/novavuvuwule.pdf
    • http://sjar-tech.com/uploadfile/file///2021062910015275.pdf
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/kogasapumoxa.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/31a3a93ebb43582f3c265099b78c959a/63976782374.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/c70e6d94c76d654a5bcac29191d25668/gamusudazajebazut.pdf
    • http://jrpst.pl/userfiles/file/66029761434.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aabe99e39---besasegexesanoruxexoj.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/e6d943e488eba06cbfcbe4503d9d23fe/vonekokosolijiremi.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/964d1b5364a779254cd2036f9f2f4f5e/33033594689.pdf
    • http://cuatudongsaigon.vn/uploads/files/27914200703.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac882e0764---juwedarepe.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076d6c15bf00---47649619681.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/bdcfcb913e4bca22f7a083510f7ebaa0/7161630558.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/pfiita1k0eleqon33meav9134r/83799337737.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9a2974d5---17506269380.pdf
    • http://buddhavehicle.com/userfiles/file/33154268020.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f61e9c5da6---vizododiderowetevex.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c43eb192763---kowakirokefovoda.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=geometric+dimensioning+and+tolerancing+for+mechanical+design+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000feb4.bin
6068b422c8789d4025a4b6523cd53ffd749f2b97d2229d86c38c60908631ca93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB4 18212 bytes
font_01_sfnt_off00012f4f.bin
3cfc352ce775b7ba77519d5678a95508c2252da2730b4be0f86e388eba03aca1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4F 9076 bytes
font_02_sfnt_off0001421d.bin
a293f0222a634a239475dc4ee618904e5d4a1e6afad3e2538314fff9554d3333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1421D 11104 bytes
font_03_sfnt_off00015b96.bin
507cfd61775067d7da0288f26795f95eed53ac5b991a0d98f7d7bcd217f9bd2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15B96 16084 bytes
font_04_sfnt_off000170c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x170C2 16792 bytes

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