Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e3aa4fb2243d46…

MALICIOUS

PDF

74.8 KB Created: 2021-09-05 02:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 864ece10288e4d8ca0a9284837ec227e SHA-1: 587e4bb2150c21c8ae47db06e18beda83525adb8 SHA-256: a5e3aa4fb2243d465f30f34ccfe461b8f6cf4ec0af3c73671069b2e517dc0554
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate an attempt to direct users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://bpabv.nl/uploadfiles/file/vesid.pdf In PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/3159bcf1ac8bea23c72746c23b376126/72074561846.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d765eb2c1---50007301434.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/84713163754.pdfIn PDF document text
    • http://hongdacable.com/d/files/93562259871.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/rumurosunitonoporur.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b933fa5743b---57001200584.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/b182f86d5c745b2bbe6e019d12d359bb/peburokekibasobubib.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/b2d0a533143232d793aedcd93118424e/mabekekidifapa.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/80192868932.pdfIn PDF document text
    • http://belloverde.net/emailer/file/solarirugujuwasodisapumut.pdfIn PDF document text
    • http://planetamama.ru/files/file/61645409066.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/57289811440.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/i4k0qfferm7n5pfq6bod2t62k7/wibebosuvivobazaxudezij.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4b155839b---66141071759.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098323b19137---wuxafadilonapelugaxoxo.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/tunatopuvefezojep.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d6f127e57e---61319765218.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/vurulex.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd44da1f81---dogusupiwovodibixobe.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16123764f4a80c---31555141064.pdfIn PDF document text
    • http://3will.org/soubory/files/22362481136.pdfIn PDF document text
    • http://70sromans.com/clients/871711/File/78057486371.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/tisivatumesoxo.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/96c02285971c2794ebf72a936e6b451e/sezuwemofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=parivarik+labh+yojana+form+pdfPDF 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_off0000bb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37E 18956 bytes
SHA-256: 6576144db7739db79b7e3de08b8c4328115d3a02bfa2929b21d0ac452037960c
font_02_sfnt_off000104c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C1 10908 bytes
SHA-256: 9beaf833a959c2f24e7e850123f3f4df05003fdff7aa5e3c893d35595dfd8936