Malicious PDF — malware analysis report

Static analysis result for SHA-256 7809d94cd91773cc…

MALICIOUS

PDF

79.6 KB Created: 2021-07-02 19:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d36d7344c3bb0f58022a6a71930ee79 SHA-1: 53886939c087127e7d85751ca02d8c54cc443ba9 SHA-256: 7809d94cd91773ccf29d1397ef25f8262119ce53733f60700001bac786d0e3db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm with numerous external URIs pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://krisoc.ru/uplcv?utm_term=chicken+salad+with+ranch+packet
    • http://taxilitomerice.cz/ckfinder/userfiles/files/riwinetoti.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607de05396ebc---1297597768.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/f13c29d7edd96725b459ad77a923180f/19927707834.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/b66ea600662f0efdff88078f40f420ae/kufisavetaxowepodo.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb5f51fc3---xazuzawozogetikavefaja.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606de2eb3b034---95763542596.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db1ef74d9b---topelunametejuzanopo.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a7234s89cfpfpr8kmap967uj41/87808547012.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d2198d08eb6---risimovaxak.pdf
    • http://adamlegal.com/userfiles/file/87667965840.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/b5ued4hj4fq0qbldofjbdl37qc/30971049817.pdf
    • http://rcp-ranstadt.us/files/xarawuzirus.pdf
    • https://diaspoassur.com/wp-content/plugins/super-forms/uploads/php/files/b48343a92db3279783bec3e910baf8a0/10886094023.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e39b0b384e---27676040402.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769212de2db---72009632496.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/36b02ab39ee602cb128ec802498e9f30/lavuxujetoxiv.pdf
    • http://guitarenko.fr/img/files/debudumutakapulitakun.pdf
    • http://axiomestates.com/userfiles/file/zovevibunubuno.pdf
    • http://timeyear-v.com/userfiles/file/gomamuwevarodot.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2c0fb5872---ginolojufuzizafu.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/rsqb1vk60tbqd06gt5gmes3lb1/21417075679.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ga9hpdnjd73f7854a9904m2sk3/24827117322.pdf
    • https://angkortaxiservice.com/userfiles/file/rutifamagon.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_off0000d386.bin
6eb8e6c95034bf65419bb70aa2000eac5949c4760d2d92240f2d7534dca41780
pdf-font-stream PDF embedded font (sfnt) at offset 0xD386 17396 bytes
font_01_sfnt_off000100b9.bin
de81376a12019db9d6625b23a6a8724360bc87b281155c15df1f6d31bbe8e2a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100B9 10700 bytes
font_02_sfnt_off00011951.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11951 16792 bytes