Malicious PDF — malware analysis report

Static analysis result for SHA-256 13af2d137c7c481f…

MALICIOUS

PDF

97.8 KB Created: 2021-07-13 21:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d1a051b11e2c819542534537a70720c5 SHA-1: a5bd391219f84ce0b52fa5aae3306236fc25cd3b SHA-256: 13af2d137c7c481fec62b5cf827d25bad773aae6f7811858001b4b35e7b480b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the sheer volume of URLs suggest this document is designed to manipulate search engine results or lure users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving phishing or the distribution of further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://huntic.ru/uplcv?utm_term=interview+questions+and+answers+for+nursing+assistant PDF link annotation
    • http://temple.mo/userfiles/file/ledelazolatogowopaduwopov.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/jenomanuvururododadeda.pdfIn PDF document text
    • http://deficanderel.org/clients/6/67/674a09facce11b7629d390eef9534ff9/File/xiwavusakuruwikemexisov.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/modokagapomip.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/s0bcast07d1gnccuiq2evg5b37/13438757570.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/d793ae0cebf62b79a81d0ece67b945ec/59599173698.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d1d9db93d---rudijulakelegisag.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/31149776876.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/07/09/turof.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16081a07e1e9d8---tuforizitafe.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0278585001620086489.pdfIn PDF document text
    • http://falerisztika.hu/tmp/22518056117.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609cafa9b0cd7---44648517046.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/8fmp3nbhp8sdbtm2diot606qkd/kemavoketovofupilixeza.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/10549878773.pdfIn PDF document text
    • http://sharise.net/Uploadfiles/files/98461455004.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/35f308cd6a5b81765caff637c9f83939/pevewunow.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/78032326050.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/53054587015.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/2140312598.pdfIn PDF document text
    • http://bociany.sk/media/file/jigimisebiwu.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/levuvofafejotidibikazap.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/5a3mfalcmrcgmt28cjobehn1l6/93725099754.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/88219502718.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160741eca3368d---56863106700.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077019e27c68---xozatad.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11962 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13174 17964 bytes
SHA-256: 781d656db417cc0017bc45a9a447cbc8563a535c1c30540ad149bb25e7daced0
font_02_sfnt_off000160a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160A0 10832 bytes
SHA-256: 91cafdedde5478f475209d3c469ecb754f610c072a6bec1ef2692b426daac668

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