Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0da4ff012fee5dc…

MALICIOUS

PDF

72.8 KB Created: 2021-09-29 10:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e832e29412242b583b9a5c71bf345fab SHA-1: 6090ab88add7c3e059d2df1f0ee6d572fd798151 SHA-256: e0da4ff012fee5dcbc3cad0d54f77d0de782138b8494a6d622ac72e360742953
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs are likely part of a phishing or malware distribution scheme, potentially leveraging a PDF exploit or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://smidgel.ru/uplcv?utm_term=positive+attitude+starts+with+letter+n PDF link annotation
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144bd08f1841---27591469457.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161339a79d39d3---88615421024.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/ranad.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/jefokexobe.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/92444256238.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614413825654b---82238832589.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/96740988694.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/rizoxibenefamakofaz.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/97503051503.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/nesutijetiritoralekonoza.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/59231520604.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/mupazogu.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/87950396342.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/sesagofef.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/dikerawomotilorebo.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/b092dc93ecce515c8ff7842053b7f854.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/bomurimemofapurobim.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/50656284518.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/sudalotanol.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7acc49736---53201423791.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/25109947411.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/bozur.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/lolipisebesakowawo.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/kozuse.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/26391699149.pdfIn PDF document text
    • https://pkbae.rs/files/96596690671.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614146e06e25f---gafelojuvuvofowet.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_off0000b891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A3 17264 bytes
SHA-256: 38e1c67edbb6465396c6a0f81456c7c350810bb51c421c65ca3b92e18e4016e6
font_02_sfnt_off0000fcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD0 10596 bytes
SHA-256: 14275d279b08cb640a116e7f9246be6d0db88d5ca1b674b8d4ac2fb4377986eb

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