Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a7f78bb4b6a925f…

MALICIOUS

PDF

92.7 KB Created: 2021-07-17 10:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c3c1bfa6d6aa709a5983f981a4d91664 SHA-1: 08c22acff21149257b0431a5de2fdce9015157aa SHA-256: 8a7f78bb4b6a925f8a84c180db8f435bc9d14cb60b8d455da77471a5b3ab9e47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://sure2trips.com/bot/ckfinder/uf/files/69569855816.pdf In PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/48699071240.pdfIn PDF document text
    • https://aashianarealty.com/file/seluwimeponupofu.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/24323232090.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdacb41202---65444730547.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d48f4dbf4---kovasatizizomonefazu.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ibuols5q8dh96cl5f7ipuh2b9/domomogejuvubefofajij.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3d6a05198---41721976647.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/5072606735.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca981ee223---refufobenisen.pdfIn PDF document text
    • https://curryleafharleysvillepa.com/hang/userfiles/files/lobimoladejovigupabex.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077035ec34b3---metoludoravafetisatader.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/84b8ac5da30f6176aa15c646a67f975c/4718137281.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a0560708e---50027288702.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/96604083374.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/t7bcet44aaijpnbp3djgtm0j20/tapinim.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/27011161965.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/nuxamin.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7483523da---26671403719.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/244c0b00224b6fafbfd20c3f96d879d2/32066501991.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/8ojdohm41lhl2krlrk944uc6hv/1283561525.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/da22a63991d291ca2ff9cad714b74a67/1094956894.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d051fad8dc---8503483826.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/xetavenabajubewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=convert+pdf+to+psd+with+layers+onlinePDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/60188757452.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_off00010731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10731 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F43 17272 bytes
SHA-256: bb8202d15aa28414bebe3d57aad18b7d45c4c598d776e1b9d5a4aa564cde3d35
font_02_sfnt_off00014bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BEF 10892 bytes
SHA-256: ce0ab34493a755cbe9483a1fce88624a48c8ce39d834525e6592d1b2a66aa5fb