Malicious PDF — malware analysis report

Static analysis result for SHA-256 1378fb37fd0e257e…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 21:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 628522ba869edafe4b0c345eba336b79 SHA-1: 52d0f0303f19dc9854de7f3a2629f1f74592bb52 SHA-256: 1378fb37fd0e257e0671b79eca549cf548b780dc834b35ef444435c439fc37e2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as link farms on disposable or potentially compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The file's structure and URL patterns suggest it's designed to lure users into clicking through to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://garglob.ru/uplcv?utm_term=game+ps1+bola PDF link annotation
    • http://chataphan.com/file_media/file_image/file/36112759078.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/lofijefibakovow.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/tukedokujinategav.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/dilusofevisalilujifi.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/sisagok.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/wisofativotelagim.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/46537836895.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/69749750484.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613642bfbd7ec---22473045820.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/60243146711.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/12911412971.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/ruzunafavonaluxize.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/88193318069.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/gomomipibawe.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/82001207946.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/pepuboxulewebarip.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee3222c881---36863880218.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/70298443677.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/pibelolabogatuxado.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/26833079191.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/belof.pdfIn PDF document text
    • https://ocw.tw/uploads/files/91588740694.pdfIn PDF document text
    • https://cargobull.cz/res/file/pesukoxuxuvunutada.pdfIn PDF document text
    • https://windsbs.biz/files/file/falaxudomomigumedofit.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f3388cef255554d7040192259384a38b/gugopotokelojobuxutatix.pdfIn PDF document text
    • http://flirdining.com/uploads/files/2808753494.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/xozirusebipasamexibemuv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE610 18532 bytes
SHA-256: dd1acba0118fe2770d318e75fc09d5c7c8050e62c6987c6ea455222566280cf6
font_01_sfnt_off00011674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8B 10252 bytes
SHA-256: 23da019b61497fa7f8b1200c0728855210f2cef3b1d44072b75054fb2aa4d800