Malicious PDF — malware analysis report

Static analysis result for SHA-256 68d30e274280ed08…

MALICIOUS

PDF

85.1 KB Created: 2021-09-01 13:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4348ff0502b73aa97066cb9dc064c39c SHA-1: edc7e65533b2b8154a1a16fddec659d21675c74d SHA-256: 68d30e274280ed0889ab02755174b39c912c04bada0fdaa03242b05b0f8041d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or manipulate search engine results. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather as a container for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ctmmaximoravenna.com/ckfinder/userfiles/files/24506146404.pdf In PDF document text
    • https://mkart.it/uploads/file/fuwasefe.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/64904727404.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/2a0b429879a8a9bb2443fe99be71b14d/60101428967.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/vodupepovewoguguwikitev.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/96461288982.pdfIn PDF document text
    • https://bloc-immo.com/images/xiwutogesifixulax.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/wejitiwodapirupuninewaw.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c79936e03---sejagaxuvigutevevu.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/pujuvajeromalasiduxid.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/4d79df10643682479cff1f32ceb3562c/6421053359.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/pevunupudofedag.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///93296031366.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/zodugewowawemamulutif.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/lubumiwofeworijeruso.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/dinizizawelunotuxiser.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-1/20210501033756920486.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608462c2389d1---vuxati.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cbdfbff80---sidaxazevivekuna.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/82865030855.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/gedipew.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/86568765251.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/21117805190.pdfIn PDF document text
    • https://majubesar.info/contents//files/22432406302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=mrs+dutta+writes+a+letter+themesPDF 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_off0000e82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82D 10468 bytes
SHA-256: 868adb8e3c2515b4ff726a8c42688a4d51d262caafe052dda7aed85b92ba033f
font_01_sfnt_off0000fffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001180e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180E 17872 bytes
SHA-256: 8e105e06111e97c466b41de2d78c34e09e4d0f6309da5da86bcb5cf3e4d72317

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