Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8037d01b4ec813c…

MALICIOUS

PDF

101.1 KB Created: 2021-06-27 04:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 287301e1657a4c39ed029c7a1cfbe8eb SHA-1: 84e574530407633b75c539c8bb14c19fa72e439c SHA-256: c8037d01b4ec813cf5c7aa0a69d46cd8ea3d54a0e0f9b5c881cd803414d4d767
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and disposable hosting, suggesting it's used for phishing or distributing further malware. The embedded URLs and link farm structure are indicative of an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9711

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://krisoc.ru/uplcv?utm_term=how+to+evolve+togetic+in+pokemon+platinum PDF link annotation
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160744e2bb3b9c---zajajod.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/69579089388.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6515757f2---bonegogabejagojedidug.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/1770127804.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f5b9cdaa887738d265d807626fc3bbd1/mivujipamikeborev.pdfIn PDF document text
    • https://etadelloro.it/images/file/zodibefuvozuto.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdb0c28236---namemugenawumiko.pdfIn PDF document text
    • http://aimic.com/userfiles/file/50487649411.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160a06ef863353---maxakanaxus.pdfIn PDF document text
    • http://tms-operation.com/upload/files/53120507019.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/vosepewajo.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160980e9c1626c---kawanuzezogawikifa.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/ikktt53bapkbvh98urfer5n93r/15134901399.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082fc159c921---zatotofuzozobo.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c563a457a41---bobovifejuzoxogizumokov.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/51sbpkae0vnaghde3q2r31t1sg/tanovukufisasuzutome.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ef9ff3155a26feb2ce9d9f81b5cfbd3d/fetakojagusunifunalaveku.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160acdf018d190---lanibaxaju.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/basapofiguwikofu.pdfIn PDF document text
    • http://panteres.com/files/files/benomupipogiwepep.pdfIn PDF document text
    • http://promador.pl/userfiles/file/gatunakupusakosobarinixon.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc3cdb07999---63861641599.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/85c8f2e1ed0dfef0a512640360cb4590/konelo.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ekchesq5ikl4rn0bje4b31obsh/liwupet.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10343 2004 bytes
SHA-256: 9a38a5251527a57ad31ec58dbe76a71db1f246040f9dd5a8cd02cc8c11987ba4
font_01_sfnt_off00010c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C87 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_02_sfnt_off00012263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12263 18628 bytes
SHA-256: b5dc9a202ec50761bf92f925cac025d28342e208438d4a9cf1cbaf71e1e715d6
font_03_sfnt_off00015307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15307 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00016b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B1E 10784 bytes
SHA-256: 894be620e5127c8e2675fbff2b4e56786e4b91a89e53fbd1b78bbe36bddc5b0b

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