Malicious PDF — malware analysis report

Static analysis result for SHA-256 0318574c9277d4ca…

MALICIOUS

PDF

84.4 KB Created: 2021-07-07 09:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: adcdf727bdce7b3fc98f9e94f87c99ab SHA-1: ad71038e52cc1f2d557ddb51713613eca96af9fd SHA-256: 0318574c9277d4ca586ae21689f6078328ec70dc578b755d39f9b33a7fc9c4bd
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and potentially disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d45b7c6b26---pagukemupozajixaki.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/2344c1c85f3e894bafe0ec088439e6f6/7962474808.pdf
    • http://heyumpnd.com/userfiles/file///4623338040.pdf
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/94457118900.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b105281d32---lefel.pdf
    • http://nuocmambason.com/upload/fckimagesfile/c71cd2cc243063453d4a6812efb69c08.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40a344cf61---62952617386.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/l19k5m3fjaaljmenttq79vbhdc/bofefizufifajogitup.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/360de33110afa2d1bdd4cabee6867799/bejogadoxetofigewitut.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/pubamenazi.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160736ae09c97c---43824784370.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/8i3tqntl9t01dtr60sqr8hdssn/pakan.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607372e845b39---35239021944.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/22b8e4aa9e66e895bcc1af63d6792f42/manovevobanezaj.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/3nmtqdrg935uj1ts667sbj9bi0/42343096313.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8c1d321d4---27971494438.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/i76s0uc79je0adtc91lm9g1ce7/13333907586.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7cb38c2bd---gumolunolefolo.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8de63a7094---72558132959.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083324900b8e---boxirubup.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3f8925f48---52979195899.pdf
    • http://dakhoanhanai.com/images/files/74705748313.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=chicago+citation+footnote+format
    • 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_off0000e7ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AC 16792 bytes
font_01_sfnt_off0000ffc3.bin
32e870d5beeabc08d48e93e3808143dd53dcea39c369729538b5d7367c86ef1a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC3 10600 bytes
font_02_sfnt_off000117d4.bin
2085b012586ada77104926a576001a15f37a4f6cead480cb94d6aa033a33b3f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x117D4 17180 bytes