Malicious PDF — malware analysis report

Static analysis result for SHA-256 3421f6b1420e7a35…

MALICIOUS

PDF

82.3 KB Created: 2021-07-09 03:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d4d75e1720585f7508f337ab8ce5d03 SHA-1: 1eb7201402b006ec5a8fd50389902e3ad40d4fb4 SHA-256: 3421f6b1420e7a35e9bd21bbe05d556fe098c102e2774c833c58a903dd3dddf6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, forming a link farm. These links likely serve as a lure to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/8c337deb2da8d9590e6cee7c7796a464/66717583011.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608de18089e6b---70411503994.pdf
    • https://anfauglir.com/images/file/12951648832.pdf
    • http://midel.me/userfiles/file/vurijubepilumifak.pdf
    • http://ilovehikari.com/uploads/files/6122234470.pdf
    • http://asianmosaicnyc.com/userfiles/file/16247651179.pdf
    • http://medicapoland.pl/uploaded/file/zapefamux.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/34tbjnihep19nh2e2o1kdbnck3/27869292010.pdf
    • https://drsaman.com/files/wodimuminefupuwim.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/924c8e4b89f7e565fcb5ba2146de25c1/kagosososaw.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e398d401b0---70592702872.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/424050568154083f061882fb15f63c00/lozaruget.pdf
    • http://bogelaipigeon.com/upload/file/kiwalis.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/0de6a660a35595912ec4ed9a338ddae9/31755450957.pdf
    • http://dnepropress.net/files/file/noxibuxutikolixivexezazen.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/jk3f06qocp2plg0vom297jdqc3/63281104994.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876f790d20c---felaget.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c305fc9e6c7---33161459359.pdf
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210623010117.pdf
    • http://bagumul.com/file_upload/spaw_upload/file/20210520054151.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=on+and+off+insomnia
    • https://medlineplus.gov/insomnia.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2f3.bin
9878c4e6750599cdac2b158b7a1f90e87b2d1bb8a712fbafcef4242060d43029
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F3 16652 bytes
font_01_sfnt_off00010ddc.bin
08da6150fa3d99f22b9dc87f1a6b7b7bb969429174f08986d1e9158af8d61afc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDC 10164 bytes
font_02_sfnt_off0001248d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1248D 16792 bytes