Malicious PDF — malware analysis report

Static analysis result for SHA-256 af29e24d850f7e7e…

MALICIOUS

PDF

80.4 KB Created: 2021-07-20 21:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7115814b107357a4c2b77797f061a1c SHA-1: 8fac8886a06006d701fa7d251069ef92158f4d1b SHA-256: af29e24d850f7e7ebdf7c457d3feec0c69b65f9e9bd565ced77d7642434ad75b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised or disposable domains, likely intended to lure users to malicious content. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://adabaskimerkezi.com/upload/file/95526932124.pdf
    • http://poltinik.ru/userfiles/file/88068640223.pdf
    • https://carlojans.com/cms/file/79387035464.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/fff95c13efcf32a775c3ad651f1cb5c4/monusodofelilexo.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6bd6baad5---lemigedenajisowa.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701bb0cdfa4---lizosexuremu.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d253ba07cf---12960935858.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/bc3h7p7lh2hp1j8k58bt4sldk2/13026848419.pdf
    • https://digireg.it/upload/noxaxixamuzakozixudaw.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/0b98507b244e83cb13b8a96d14c58e0f/vilasofa.pdf
    • http://akinmedikal.com/uploads/file/27248925137.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/d19311055fff19ccbf19ea485b6e8a9d/wumusom.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075f18f8e5a1---60775867277.pdf
    • https://magnettoptan.com/upload/ckfinder/files/26749679796.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106030736001141.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607069b860ea2---94761896465.pdf
    • http://lapenya.cat/imgjovesnaves/file/rabomus.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/d1lcd56n8bmhu6cf96k6j0uv74/faxazuzetuzakafarala.pdf
    • http://seoulmenu.com/uploads/files/38284919205.pdf
    • http://theartofdesign.nl/ckfinder/userfiles/files/xadesiwedutawu.pdf
    • http://alhouti.com/userfiles/file/pamusifawomodokofi.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4569e103ea---susedunezonuwizoguziwewe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=praise+and+worship+ppt+template
    • http://janyska.home.pl/_mjanyska2013/fotki/file/10678325257.pdf
    • 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_off0000c4cb.bin
91dc1156d232ccdc3ec176ef3aa1ae55ba792a09f391d81ff080b182352a1751
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CB 15944 bytes
font_01_sfnt_off0000edc5.bin
b82c51f6f697aa4f67e3560675c810324fb01cf58256b247245da5b5cf4a03c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC5 10744 bytes
font_02_sfnt_off00010643.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
pdf-font-stream PDF embedded font (sfnt) at offset 0x10643 16164 bytes
font_03_sfnt_off00011bb9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB9 16792 bytes