Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5dfa558a5e26c28…

MALICIOUS

PDF

83.4 KB Created: 2021-09-13 20:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ae0e7b6d500140cc556df34fbf6108cc SHA-1: fc65afddb34a5b4d7d620faf23bead3c460e3426 SHA-256: f5dfa558a5e26c28eb49f3b62f3e7077aceb8e026e31d5b3b93b18afdad141ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and potentially compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://inwebjor.ru/uplcv?utm_term=shadow+fight+2+unlimited+money PDF link annotation
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/rinizurujovikitikow.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/tavapodob.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/fexaf.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/40695584936.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/tagixoxigokobim.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/xagopodo.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/59257843621.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/kulejibulire.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210902002419.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132fef7f2f36---38238840780.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/67859311664.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/wedopepoju.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/215b945f6b2eb82366c3a4d028bbe730/solunugi.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/dovofanuvisulela.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161322e91da9d3---930925154.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/vunudubipinosikomozuf.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/49728456993.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7564cae24---nozaw.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/44459914535.pdfIn PDF document text
    • https://norservis.cz/files/files/kegatu.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/ffa48a73975de76ffd815d7280f78004/pidetesanizozusiz.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/tikijiwenafadujofo.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_off0000e172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE172 17444 bytes
SHA-256: d74fce618f7b53718cf362f6f20b6a439a8a941b5d4d160ae132368a4f8f5647
font_01_sfnt_off00010eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12704 11028 bytes
SHA-256: bad1cbe68a162e8539aa7419926ffc5c0efc1dc960fddd69123b584abb123f1b