Malicious PDF — malware analysis report

Static analysis result for SHA-256 44938a8588d7bab2…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 19:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: edb6e567c406c909e5036c8023d1f443 SHA-1: 8f85d372fd901925280b89412b60723488ca14fa SHA-256: 44938a8588d7bab27ff2c19752321ddad8955e1878aa9c46b9fe82d10f1f4a82
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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 https://pixomot.ru/uplcv?utm_term=install+wkhtmltopdf+ubuntu+18 PDF link annotation
    • http://hoteldanang.vn/uploads/images/files/88409195554.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c511a8e76---87501857766.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/30cd1a7b6b0d88fc3e9af0c827e1e014/66897346680.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/xomevuwarowejotol.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a734357fa---terolosazemix.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/36223683921.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/22345464031.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/mifef.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/sudawugakomudomarovenabo.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/zugelomekagifefafel.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a66bf2aaa64---xevekukuwivefoji.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/4108dffb501be987b9cc1002137dcfb5/zidap.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1432e2009f3b951b90bc9021d60db9c5/gokogilenidaraj.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/sopijeronetanarerotatis.pdfIn PDF document text
    • http://poultech.net/d/files/vububobujat.pdfIn PDF document text
    • https://petek.biz/resimler/files/pasironibosudejudet.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6d721ba9c141c8bbb453e82db2654061/65928304462.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/b60c118c4e56c3494ce316954c58f729/tejipaz.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16095c6aacd2f1---soxaponumobumiris.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210810_9A67D56AFE6A305F.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/saluwogovunu.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/71590549450.pdfIn PDF document text
    • http://jkohut.pl/file/wubidigelasu.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/91812703047.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9bc6e8e7c---doxaletovugevorota.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/sanajazomevulovulibawo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC511 16632 bytes
SHA-256: e5a556513545317a657341e0a72af231d9b1ec4984a262c5dbde216f49f92829
font_01_sfnt_off0000dc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC83 17400 bytes
SHA-256: ae50e2e2b53425bef4d3c96ab2f5e7228138cce3008e104b678f7ecd0e3917d5
font_02_sfnt_off000109d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D5 11068 bytes
SHA-256: 7c39f7aea8639571b293ae9f4f47b4c99ef03f7cbb10e8f683d0684bb61f09a8
font_03_sfnt_off00012350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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