Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7683ccf3ac731c3…

MALICIOUS

PDF

92.8 KB Created: 2021-07-17 13:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2003b33106cf0e0df184960247795eb SHA-1: 568d0f9a49079194f68f071fd28d2537d7e76b66 SHA-256: f7683ccf3ac731c3603d9fcb8a8e09f0f442ac73e08b1d8ae7e27247724ba715
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, designed to act as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/f29ee904316600aa063154ef42ffa87a/babelagalaxonapuwakaz.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/0d8cd4817aa6eb541417652a5321a4a9/34173184352.pdf
    • https://accounting789.com/ThImg/file/92890834118.pdf
    • https://area5srl.it/file/nunuzepobowevesitig.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/400fcbb9071025aec2af465d4df6d3bb/metukamiwuxefositudovokij.pdf
    • https://hansenlight.com/UploadFile/files/67400113769.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/1e3b586c4926207a0eca82bdf3594d38/6974782217.pdf
    • https://copab.tn/216mag.svn/uploads/files/lujazavetijenavifob.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ce046f3a810---79058095135.pdf
    • https://congchunghadong.com/uploads/files/pegebefumedow.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/3d9a6ef4b5325ae909b5371ba4eac31e/59841805684.pdf
    • http://sotel-perm.ru/site/file/munuvowozazupa.pdf
    • http://hysansam.com/fckeditor/userfiles/image/4137536529.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/2dke4ajc1volbfa6mahlkompg6/23563763327.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/1267adafee423c8efa7da61b16e59921/64376422122.pdf
    • http://lmyc.net/clients/875386/File/pejejipika.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/kugudopisijiladarunezuj.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af3daed8e9---67090679057.pdf
    • https://detskeihriska.eu/ckfinder/userfiles/files/80516724354.pdf
    • https://watertorens.nluserfiles/file/zotog.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/3a50416b195bb4b78152f3fdda5ea343/xirojofurur.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c50a92960e---67567686707.pdf
    • http://georgekoldun.com/var/upload/file/vafigexelevifanufakalu.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f38422b135c1fdd87313588e896f1f5d/94559649259.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+do+red+hadouken+smash+ultimate
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f39f.bin
d164cd26ba1fec5dff968ae8c6a2637135279e3495a5d25f40f608a5f0dd5626
pdf-font-stream PDF embedded font (sfnt) at offset 0xF39F 4724 bytes
font_01_sfnt_off000104ec.bin
c0ce872c12ecb593d1259b848dd2054615630d4e3672e6b41e97ca8a992b2d13
pdf-font-stream PDF embedded font (sfnt) at offset 0x104EC 10784 bytes
font_02_sfnt_off00011d8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8D 16792 bytes
font_03_sfnt_off0001359f.bin
9dcf5438be3fcd2ffb0194e9747becc14607217883d06b347f741c07b9d992f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1359F 18352 bytes