Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92343163d6c97b6…

MALICIOUS

PDF

85.7 KB Created: 2021-07-14 02:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c79f649a1313b7b543212d5927b14e7a SHA-1: 23809282bfcb6672b7174c85e20db0f159519f94 SHA-256: c92343163d6c97b6248d9d58f2a02c6596b5674ab092f4b0a2a60f8f688f2104
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting, likely intended to redirect users to phishing sites or download further malware. The presence of multiple links on compromised CMS upload storage and disposable hosting reinforces its role as a distribution point.

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 http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/p7olpue66n2fmh451pb5t47b32/zesagujofexupowowakoli.pdf In PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f38d56b96b---piwipubugime.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/29240356445.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/10930036983.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/c612fca335e4333f46e0bddfd961c1ec/80541345901.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8032eed85---75043195065.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210608_114214.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/4752119395.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/wanajoti.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a551b8043ea---munagabunoxosolate.pdfIn PDF document text
    • https://service-panev.com/userfiles/98281195758.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/37003993939.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b6ff794f0bd1370398a48342fdd2ee2b/77177763157.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/0ser7mambjj9c64t5i7a0cvji7/6461467003.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609fabd95f13b---88798306340.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/79134994734.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/1c61eef701e45afbf222d22156881b1a/23861657908.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/cg31512juqt0363k4442gi5aum/pisudipenanabuv.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/23948976911.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/64456376735.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/bsahaft7cvrvf683ktfttri3rh/85088739858.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/xazosipenijafimorafiv.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/68bacdebd70afca5c199f05ac6a6ec5d/jugunu.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0096385671---nukekoxoviferamolodoruler.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=construction+supply+chain+management+concepts+and+case+studies+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5E 11312 bytes
SHA-256: 90c464b372e81cb6ff7a6684ebfe6c36e202163e138f5c886a516958a6781360
font_01_sfnt_off000105ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBE 16712 bytes
SHA-256: d357e0874af62cc1104c2223029293fcf5eed98efcc182306afd966cb6e203e7