Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec07b44afe4b566…

MALICIOUS

PDF

76.0 KB Created: 2021-06-27 07:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af53ec19ec21e28e4c0f21245b16d5d4 SHA-1: 770a07f5be05a815ff36d422f0dfb95fdbe69099 SHA-256: dec07b44afe4b566f0cfb47cd9e969ba1451e293ade7475ed5a8adab8223a6b1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress installations. These links likely serve as lures for phishing attacks or to distribute further malware. The presence of multiple distinct hosts and the use of disposable hosting suggest an effort to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/1dkd1viooaf94bgrpm3o5obuot/69104424059.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba244a7556---12439981108.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8186140e6b---lebugi.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9b2d98fb8---39454005292.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b08dee3f70c---32759230673.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/720915967c5a8598ee1e3acdecd46b92/60262340400.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090118551894---fivumilu.pdf
    • https://tavcam.com/upload/ckfinder/files/lilisuvatezibaweru.pdf
    • http://panziofabian.hu/fck_kepek/lunuzudun.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160946db71e9c5---fazurewerowijobawarumo.pdf
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/117ee99dd75b4cd44101ae09e99dce24/2350901159.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607d729a80c47---83238619627.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210618040257.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9eef8607ca53d0a8ba344502a674a53d/17193467904.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608242efafff4---juzesemefu.pdf
    • http://otoozevran.com/resimler/files/78547523961.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/d1f6b7230d0bd27cbd899d3e1ce0a460/vajanuwakiwinirog.pdf
    • https://an-professional.ru/img/files/file/31242742276.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c82e533393---jaraxapikikojuzotugesav.pdf
    • http://www.abcklima.hu//data/editorfile/xixefapewusalifuw.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/b2960ef184e0a3dacf2fb23c08ae0e4c/25784156725.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/feebc728d33c106ca8b122fd609a07bd/24234185376.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160983b26b517a---xewopekibazepimivizotopuf.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7ff47575e---10056941000.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+sum+of+first+n+natural+number+is
    • 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_off0000b645.bin
489df008685ae1104e4ae1dd76787f4ed4175f6454e87148add4d666e099a1d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB645 14344 bytes
font_01_sfnt_off0000dace.bin
325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDACE 16084 bytes
font_02_sfnt_off0000effa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 16792 bytes
font_03_sfnt_off00010811.bin
f19377dd0f8c6fdc54d1c603ed0182c465e83455f67aaf6c6af9401b07b3c7c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10811 10680 bytes

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