Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76fcf46e3d2a090…

MALICIOUS

PDF

72.2 KB Created: 2021-06-29 16:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca89736a508a362d41dcbb56dfb5a480 SHA-1: 49b9d1f8475d94185e069ffcfecf53d9e457812b SHA-256: c76fcf46e3d2a090f06630ff019f2465da8f7a426d3332868dda8c3569ef6195
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains a link farm with numerous URLs pointing to compromised WordPress sites, likely designed to trick users into downloading further malware or visiting phishing sites. No scripts were extracted, but the presence of multiple compromised upload links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d813813169---mudojewukisovuzore.pdf
    • http://dorp.pl/userfiles/files/92411108583.pdf
    • http://xedaptap.net/userfiles/file/rulol.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/1vd3420b1iq2dt08h90er39eo2/nipuvigu.pdf
    • https://radmangroup-ye.com/rgfiles/file/juloje.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/ba6cce91e77d67a2822f1e4997b92528/jagikek.pdf
    • http://alohatoypoodles.com/clients/1/11/1122824db0f83c9e74cf39311881f217/File/94489478113.pdf
    • https://medtek.vn/storage/file/68992220122.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/0mdqatn834sbahi4reoo8meom8/82301676084.pdf
    • https://ags-car.com/upload/files/xavixumik.pdf
    • https://bititechnika.com/uploads/file/korosizifetubadaj.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93604d68ba---46718919907.pdf
    • https://wfca-czech.cz/temp/userfiles/files/bepodo.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/3v0cnl2nmvlol50i83q2ml08vg/34135177613.pdf
    • https://emauto.lv/index/images/up/file/72193469113.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cec875007---benoxatevobikodoji.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac304d150d2---8704935687.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/81a1d3c0c69acf7f7ff8779129e85822/97387883695.pdf
    • http://musorcentrum.hu/files/article/file/zakuzuwedofixi.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf497638b3---96015127254.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/hu2ohg0c76dflu69kv9s4stc5o/6288972573.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/vbhd823t2kif7psen7ls5d0gf2/kopeguzutaburulonibino.pdf
    • http://beergolfers.com/blog/images/file/96993721205.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ionic+bonding+physical+properties
    • 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_off0000bac0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC0 16792 bytes
font_01_sfnt_off0000d2d7.bin
5a4bcafde7eff5c7aabdddbbe904ec2f9ac8622d8c7912154df283ab94d46aab
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D7 10996 bytes
font_02_sfnt_off0000ebe6.bin
07f209054dee25968f7bc8b3ef13faa6c517f3995e78a51864f5feba273853e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE6 15592 bytes