Malicious PDF — malware analysis report

Static analysis result for SHA-256 684534afa42d40c8…

MALICIOUS

PDF

96.6 KB Created: 2021-07-04 05:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e4d5f20cbbdb2a62c7b1ef347d1e9985 SHA-1: 1130024c95cde32541f97efbe70ef1a1d25a666a SHA-256: 684534afa42d40c81f0057e67aec68246b87ca5b2b761ce51c2af69b08f3682d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the overall structure and URL analysis point to a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://philabc.ru/uplcv?utm_term=job+opportunities+for+mba+hr+freshers PDF link annotation
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/jrfv8hjaggo5el52ij38urq33c/danafubaferitopanowos.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/16643653337.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/30e59edf06630a32fead9abf361a7936/37666539987.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/ef500eae88722f50ecb3366c95678ebe/govesilev.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/euqevt4g71hn382r182bpf2ga8/34003624271.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/42365342502.pdfIn PDF document text
    • http://iphysiology.ru/upload/20748057410.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/60174221533.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/vadolonegit.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089a8e75acb2---21150945258.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9ac1dd201---32249669976.pdfIn PDF document text
    • https://alutat.com/data/file/nalil.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/ee03f6d2b5ac6d868122c14eaa9ca8b1/21463258513.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/xozew.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/qk0v2dpedks5q6g4785lsh1m1m/lozazuvapi.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/pijamegenigelukudojojef.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089180343c78---69203682012.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/komejuzowevomagiput.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160870eeda29a1---rerubi.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/5b7enbvcts7ss8375ubqumhcj6/boxipabixipeninuzota.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdeea8b42cd---29789406989.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/tadas.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/74884707554.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082a9e260f68---mubeto.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/45521124258.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be0f69ea3ec---45880479922.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_off0001141e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C35 10808 bytes
SHA-256: 1ffa611e120c92d658622b33885b8904ff5e0e7404d221fa20f936d3aff306ca
font_02_sfnt_off000144b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144B8 17640 bytes
SHA-256: 56288c7c9e936b834ac44daf8d84d9e25de6e3c5abf8ef7a94313d05e6bd9902

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