Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74fa95a603d5341…

MALICIOUS

PDF

69.7 KB Created: 2021-09-27 05:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 5b64b61d3dd67f885d99b431d7d2849d SHA-1: f74858f59ca30f452ca1173de75364f6cf5bbd51 SHA-256: a74fa95a603d5341471e2d04f50f4ae7cd1247f8fc0ad39e086bce81deed4e81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, suggesting a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=how+to+check+my+phone+was+hacked PDF link annotation
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/83959397731.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b64c6b899b---63552763983.pdfIn PDF document text
    • http://seamacros.com/upload/file/xuroxowusovefoxupax.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/8eksd2avmb1svt8gnlcihncpf4/tufidekaxadexeze.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/5815833268.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/pibezu.pdfIn PDF document text
    • http://abnicum.ru/files/file/nugit.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/ratifesakikekikelinidu.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/sunumujitus.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f7bb39a164---pibivor.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16148a0f0022d7---65367598673.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ijala.pdfIn PDF document text
    • https://anfauglir.com/images/file/21026637666.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/xokurob.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/81703527126.pdfIn PDF document text
    • https://angkagenap.com/contents/files/67072946480.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/20208308250.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/33604296857.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/selebalamurofitefapudawus.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/44277227451.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/87945236209.pdfIn PDF document text
    • http://myesen.life/userfiles/file/65532868652.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109180436052374.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/86992945755.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210911174926.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_off0000b394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB394 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA6 14508 bytes
SHA-256: efefa60800d1adc4205fb28e637de39a86b49cbbe1d2483440d8725df2e1dc9c
font_02_sfnt_off0000f00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00A 10824 bytes
SHA-256: fd537f0a06c4ffbfdcefb581cb80ecaf1d691e81689409223cbae17035537854

Open this report in the interactive analyzer, or submit your own file for analysis.