Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9633f2a013c3366…

MALICIOUS

PDF

84.0 KB Created: 2021-08-21 23:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9cdad4e76ee55d08d4e1551dbb4f91d0 SHA-1: fe06b019b1d945a39ec56fcf0b70a77478e0d51b SHA-256: e9633f2a013c336633f338db0008ea0523aa9aeee682af49a9ad4920a69e45ff
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the link farm heuristic is sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sugarfree-gelato.com/upload/file/96486307170.pdf In PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/72e05567c24ca76a1f90532b9627283a/92211910616.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/7874279543.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f1b3da1b1---98085351067.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bf5f107ce---51973878142.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/ab45e0f2e076d0cbda050d52134c2bf2/wosokukerifewotabodunukag.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5c2f97bc7---77880492553.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/fabigimukosazedapifo.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/mj5qun8hl10nb5p5s34sgiuj2r/13620836075.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/mefakajoworugokepalitaje.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/3198d5a8a97793f07cb7ebd571794e60/10770001110.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160708834d3f9e---malin.pdfIn PDF document text
    • https://bgmediation-flm.com/userfiles/file/85451630495.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/c6a3cb480355936d0d3cd8c0dc9a26e8/titekoziwefadavube.pdfIn PDF document text
    • http://atek-ent.com/upload/file/2069520076.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/e4494346108bd1e566378130b0d26395/memop.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210719_3254AF157FDB9623.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f8c6047de---xamukezetifanetiroz.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/32940846953.pdfIn PDF document text
    • http://adamshs-pdx.com/clients/d/d3/d3c120c733f7363e2cdaef2cff5f3687/File/49471952596.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/mogudizifeki.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/likigomojij.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b600cf123a3---fukaga.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/50275979096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=why+is+zagg+keyboard+not+workingPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE289 10964 bytes
SHA-256: a1632a0b1d8189561d658ad6b1f622a4d2ad8dc46ac5afc74fa28b1614e0c734
font_01_sfnt_off0000fbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EC 17532 bytes
SHA-256: ad440e7ee74ebab8269361df678ba3fb82f764696f04ef2e80167fb560e039d2