Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fa2d2ef0f2075b8…

MALICIOUS

PDF

75.4 KB Created: 2021-06-10 21:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6cd768e09a3ae7e15383f38370c954f3 SHA-1: 714e6ebd32b36c080dabcf7e626e5a362b7d6738 SHA-256: 2fa2d2ef0f2075b8cc1ec12be2528a1ea4ddf5a8bb3bee52b5adc681b67c06b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. One prominent URL, 'https://coretry.ru/uplcv?utm_term=1+to+30+elements+with+symbols+and+atomic+number', suggests a lure related to chemical elements, likely a pretext for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 https://coretry.ru/uplcv?utm_term=1+to+30+elements+with+symbols+and+atomic+number PDF link annotation
    • http://al-bandak.com/userfiles/file/5509098027.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/94141919153.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608251504b878---71477247138.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/9d7c8c354ab0898375bdf68febe981dc/museri.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/cj1s98trq8glk0pgo1gmclfdae/82049292222.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f81859d467---96994941338.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/a12f6350b7cfa3341c70e60ac6014b32/15145494753.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607644189016e---87023745428.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/e66d9c2536ece1de4ec7ddb8bf3fc5d3/46948124543.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/89ac72c90d21ccb3ff4a7e0292ebd950/ratibinizumabekis.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/dudulinobozivatu.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160802e7cf369b---77878251367.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608adfb21c956---fufavumebaxuju.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/7664da64718d7fc71527f36dea434e38/90838401754.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/d8e9610a28026514b8abb21709809abd/lezokawupefumaxorogawan.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608437699afe3---13147208981.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F2 5776 bytes
SHA-256: 17bbb7241206ab2c5a16772c6387b3da7844bb8e618c3c030283bc7123e19c39
font_01_sfnt_off0000fd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD85 10536 bytes
SHA-256: d12b2754626650374b0a4d51a51e5277a36f0874368e832c6437cd8bad530dd0