Malicious PDF — malware analysis report

Static analysis result for SHA-256 62fdf6b170f963e6…

MALICIOUS

PDF

89.0 KB Created: 2021-08-20 20:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 674451bbfca98062e664a394235164db SHA-1: b7551d9ef0473f3e2df8fc2251bac3883af3f635 SHA-256: 62fdf6b170f963e66b6066dd028dfe029ea5e15b1c02bd067add84eb0930a78c
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://crysiq.ru/uplcv?utm_term=streetcar+named+desire+themes+litcharts
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160dbabcea4e94---venejakixovetew.pdf
    • https://laps.pl/userfiles/file/xifuxos.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160defdf1ecc15---38530195020.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4e12e9ace---kaxawitawat.pdf
    • http://dienvietbac.com/uploads/files/34520568206.pdf
    • https://diedacorporation.net/freesiafiles/file/pebemazanu.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd92c241ca3---kuzulalixija.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/orl1j688nvgob4erqj9eruggh7/44585775840.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dded3830ab8---35662544150.pdf
    • http://langeline.com/ckeditor/upload/files/33057164517.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c7eaec7a7---vufujovurax.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f05bbdd18c---dagisalewuwanevezemexef.pdf
    • https://isosklo.cz/uploads/bobaje.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/42c919a94b753b237377b2c6a93fbbce/52251722674.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843077c1c6c---bumeliwekipilikej.pdf
    • http://giovanninociti.com/userfiles/files/61897539459.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5edc2886c7---72904367748.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/db051426a437c31920f54cc37c483582/lenidugiwipedija.pdf
    • https://fibaquitaine.fr/cebatrama/userfiles/files/wirof.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160cba97e98825---netibamax.pdf
    • https://keepingscore.org/userfiles/file/gubuxugir.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160716bc7181cf---bemodot.pdf
    • https://fanaf.comarticle_ressources/file/jafesabuvewixugudolusur.pdf
    • http://4darchitecture.org/img/all/rupepemom.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f571.bin
81f9aaae2f271948ae7d61cf2b2a915f880098d8e55bb64bb4989fb7ab3017f8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 18504 bytes
font_01_sfnt_off00012510.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12510 16792 bytes
font_02_sfnt_off00013d27.bin
b50ae159fa3ed17f385fb7a70ddefb54236f51a2eba7fea1f65030c523dccf94
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D27 10588 bytes