Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe783375318db1e…

MALICIOUS

PDF

74.7 KB Created: 2021-07-03 08:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9179b342f0a90b21bc2d1de299aacb5a SHA-1: bd9d8d9142deae3b326f532c6ff670d5d9004924 SHA-256: dbe783375318db1e7fd0203aa9295f91f433c3cd5c7f74ce8928a5d810f4b8ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/694f749d7d569bf7a350d93a0e05999c/21554611776.pdf In PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/8ed4ad56786e0fc302fb438d2b345b22/fumewaxikis.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/basekabofogaturuwavu.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/85484645830.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de5c151d04d---zuxigumudagek.pdfIn PDF document text
    • http://guitarenko.fr/img/files/kajaruxibidafivazuvedudi.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/22457068064.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/0de30843c5847e83dcdeed8d0f7af822/17698737117.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/89592106909.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1914ea9f3---68383813794.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/1a3ad3e0ee1a184bc55f5b7af3765219/38985100716.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/bn3l2tov91mst8a84gbilr5pf1/jevenefanuvosan.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160adcd0faa916---12390271095.pdfIn PDF document text
    • http://budka39.ru/files/rawasifonunofugixipif.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609c48a819a9c---tuwopojimixavarakajewaz.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/dowiramufab.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9bead599da---35101323655.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/d1b6402254df7d96362f883f2cfeb14d/89324953551.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/13017222260.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/sexuvevodovepefopox.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/noxon.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a1107c4381e---gufuwukajixojugipojemig.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae422124d6---66301288075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=top+10+fastest+computer+in+the+worldPDF 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_off0000bdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF0 16724 bytes
SHA-256: fc884b52d7266b177b1e903341db35ee84f8ed9a855c678e673ef569c1e19ebd
font_01_sfnt_off0000e966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE966 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001017d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017D 11208 bytes
SHA-256: 69793ab9dc13cda0dd4d05abceff841a43371623c635c86ce5f7f120ec39996d

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