Malicious PDF — malware analysis report

Static analysis result for SHA-256 378c021a12f3c764…

MALICIOUS

PDF

85.5 KB Created: 2021-07-05 06:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e5b444c70c541c6cab69e83cd539fc7c SHA-1: 3ef6b68900cd0f23734af297c28d802874bda070 SHA-256: 378c021a12f3c764bfa6a140b5d05c7972dd0fd08b07039cd61a0ca0300adaca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, specifically within form upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4ba7bbe0e---jakipabilodikotulovipejod.pdf In PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4de025a2d---luzumizawedoda.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210605_010503_7104.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/spmpl0n3p5nokphj1imqnj10h3/92860793703.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073197094ed3---61179959169.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078611b03559---49952782387.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/82d213197bd07668389872a4b429bd9e/walijulededafabilusunexi.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/fijasozufamidabod.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/93dd16fa3ffbd554c902d930f0779cd8/sugijexeresuz.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8aebe65a9---79644651362.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/tamiwolejemakiba.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/24249218537.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/36556384634.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/83637762961.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160799760865aa---38793767904.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbfd580b8d---12833441309.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160889dd8a85e3---53372945865.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/41756504881.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/faditijolejamakalunawi.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823e4e531ba---39190997572.pdfIn PDF document text
    • https://doganagolosa.it/file/55329826725.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///zogike.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073b231a36f8---40201338399.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/bulugajazoja.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/vovedomobajanapuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=active+sentence+to+passive+sentencePDF 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_off0000e774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE774 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 10268 bytes
SHA-256: 2e4cd79805f9b8f988834d1bcff21d6d5bb608a4827b9a26caae22c080e7c1b9
font_02_sfnt_off000116e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E1 19344 bytes
SHA-256: b42311a2bc7214eccb952d0b29efdc4d4a3caaacf0c060009bd146ed0428d308

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