Malicious PDF — malware analysis report

Static analysis result for SHA-256 328d4a58f5845b59…

MALICIOUS

PDF

85.6 KB Created: 2021-07-14 07:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c4e064e9bf76d3dd3edfc59eeb667ce SHA-1: a77981039c1f3769410ac4b24143e8f9eff3def4 SHA-256: 328d4a58f5845b59bf429e9d729f9e5b07ca6e845a6cf5bf315711c9b45bb89b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by a ClamAV signature and an ML classifier. It contains numerous URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs indicate an attempt to lure victims to external, potentially malicious, resources, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/p3se3ielcfdn1j0mersvvdjcc7/fapexobivajokib.pdf
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/fulasana.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087766c5e137---83455102534.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/2fd55ae546131fc37e22cc5429a28458/80866187139.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f77c6e0da---goviwodebebuvuzibevenod.pdf
    • https://dichvumayphoto.vn/webroot/img/files/julemotuxolotopipog.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609281d02d36c---nolotojovodawi.pdf
    • https://anaksemut.com/contents//files/lajutapoderexiguwajorix.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cac6c45448---12345158304.pdf
    • https://lamthong-marchph.com/piceditor/file/zivenefawokusudakegatu.pdf
    • http://bixenony.com/userfiles/files/jodelonexovesa.pdf
    • http://jerilyndavisrobison.com/clients/870655/File/suluxeworizivani.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab75c05674---vanamowesabozal.pdf
    • http://dahchen.tw/userfiles/file/xejuxulexipezu.pdf
    • http://melly-incendie.fr/img_db/4773217426.pdf
    • https://cam-ceeds.org/ckfinder/userfiles/files/52233029208.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/7f5db9a00ebe19ab58c6d48e890e6c1b/warobifotuwojexo.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bdokmdelhl2s1h9sokfbdndn83/47359942606.pdf
    • http://hillandbrownfamily.com/clients/76964/File/zamusinoruresiruminixeziv.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a0feb1da5---51865025208.pdf
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/34652077633.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607193f87fca3---bipajel.pdf
    • http://aucoindeshalles.com/menu/file/81558511830.pdf
    • http://0-50.ru/userfiles/file/xuwevibevi.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/b03feeababbfa6ba44583ced3d915f2b/50393752231.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/1qn44p9cgml1tnub9r9qntarq8/47550423124.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc85fe3909---99057265702.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/270c269a54dfda5b5fe61cdaef5a625a/44642490316.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=outpatient+x+ray+near+me
    • 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_off0000ef9d.bin
1c2482e16cebe47de4fe051cd3be0be65c9f65227a6127fae5c4c9b546fec40e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9D 16088 bytes
font_01_sfnt_off00011933.bin
d0baf4bd842c8fab54981d3bf6d2341a473b2b0d8de6c7ec54ce8ff1f51bd382		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11933 10420 bytes
font_02_sfnt_off000130e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130E7 16792 bytes

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