Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc19883673c4b3d…

MALICIOUS

PDF

89.7 KB Created: 2021-09-22 12:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3c3905d8ffc968bd75dc31908f63ac96 SHA-1: 1d716f736096c87a7a43b0dd313c5a1b2c01f4bf SHA-256: fbc19883673c4b3d0b5357dc0fb3927f8aacc49481e331735873c1d383b3dad7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites, consistent with phishing or malware distribution tactics. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=garage+frame+unturned PDF link annotation
    • http://al-bandak.com/userfiles/file/sowufimejezaboma.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091217143742707.pdfIn PDF document text
    • http://villaroyalenews.com/userimages/masifudomomukibejet.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210914112322.pdfIn PDF document text
    • http://domuran.pl/files/file/77603262163.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/9017889998.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/miposovarilulule.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/uqcb02jl0e8bmlbp06b7b9t940/nesuzezejuvopubojesikeko.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/sokabitivug.pdfIn PDF document text
    • https://purefeeling8.com/data/file/fenopeverererewotoxovugi.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/rogar.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149227dcc626---tukakonegizotoxezis.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613695226efed---35609447679.pdfIn PDF document text
    • http://chinazzjx.com/d/files/73552999989.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/96646501795.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/sefepevidu.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/33437971038.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/zuxezefapixipexe.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/doviz.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/xusopaga.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/mosaporo.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/kawekapafosetoko.pdfIn 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://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_off0000f726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF726 10408 bytes
SHA-256: 6708461db8cd82773fd44a4181bbc7ee2e05c95550b15157683c6f55070ee9c5
font_01_sfnt_off00010e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E83 19648 bytes
SHA-256: a5bbbf599f8e496009f269194bec9657700762a20bae3cf6133641a923c5ac4e
font_02_sfnt_off00014137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1