Malicious PDF — malware analysis report

Static analysis result for SHA-256 901a350cbb9cf33f…

MALICIOUS

PDF

91.5 KB Created: 2021-07-04 07:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b35ee9a563adb0ecb87073f196bf8470 SHA-1: b4b7cc1fd8b818cd9754f0e97b9bef297ad3cbb2 SHA-256: 901a350cbb9cf33f13dff5a05a7f9eea174960acf96383f4c982c6749cda0a0b
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites. The embedded URLs suggest an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://splogservice.ru/content/file/litezobanuwi.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/lvioo8m93regqunp8kfgksohtf/44052457611.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/ce4d51a8b8ef9c4a8822145b1ed105cf/15709167973.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608797b5b247c---84236925908.pdf
    • http://konyaozgunmobilya.com/userfiles/file/534808015.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/eofo51iai298sb97h3hg68r2s2/vajesote.pdf
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/79d2ddb54c07750b88738abba187b374/60027560175.pdf
    • http://bannhuaduong.net/upload/files/josinusu.pdf
    • http://thesetnews.com/images/fckeditor/file/zinexidadume.pdf
    • http://graciaindoutama.com/kingkong/userfiles/files/70703417575.pdf
    • https://profix.fr/ckfinder/userfiles/files/jojexovejulupagawivelu.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a521ac5ad02---niwonefinutifuwin.pdf
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/xenezodomadebufubapoj.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/daujmknu536rrdnbk0oe9ge320/nudezupebowomowo.pdf
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/gutomewe.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/6a93099b0ed1cefd536088de668da1f0/13199477511.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/5a8nmj8nvcfa0g41e8kusn1bue/63543782274.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f0e659d63---ragawuparagenom.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/hsnde31abpbn0o5acntdb9nndp/wuxiwekuxakamamajolip.pdf
    • http://designklasse.de/ckfinder/userfiles/files/562178500.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ace6b4a1ae5---63611298919.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084caea09529---45769806857.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+get+antenna+tv+on+firestick
    • 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_off0001043c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1043C 16792 bytes
font_01_sfnt_off00011c53.bin
470be61d4d6fc8e6892d5278f3c7fa22653a89d91a297ee6df9ef3aad7a4dc00
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C53 10700 bytes
font_02_sfnt_off00013511.bin
5d3e030b85ec0b1102a5d98b65b37a570f48e6af6731929ba5459b8b86f95100
pdf-font-stream PDF embedded font (sfnt) at offset 0x13511 16868 bytes