Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1d7a4d2349a0a3…

MALICIOUS

PDF

73.4 KB Created: 2021-09-17 09:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7b01c2e90ccf27e712699595eedeef75 SHA-1: 000b2b00c0913136fe1b29ea3e5dd5dbd421d550 SHA-256: af1d7a4d2349a0a3c79751f57893f342ff385f07be4ec71db3b873ed55f7eaed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or conducting phishing attacks. The presence of multiple external URIs and link farm heuristics points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://synerhu.ru/uplcv?utm_term=how+to+view+private+instagram+stories+anonymously PDF link annotation
    • https://galaxytraining.examinationonline.com/files/gofofenijavaxuwit.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/zikazud.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/67343591012.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/riwog.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/94942672905.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/71427106735.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/kibopifenijitajoxaxu.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/rugusedilok.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/vizofozifal.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5830ec66e---rurijevoko.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/98217596337.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/movopalubopa.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25302752996.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/40655709520.pdfIn PDF document text
    • http://nscenter.cn/upload/files/lozazotegesek.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614236f59309b---sibezazasudove.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/rugamekozezunovapam.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/lomejidafagawazomuv.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210917_010659.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/68222008103.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/26562744759.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/12356697055.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/lunufa.pdfIn PDF document text
    • https://mollis.rs/files/bolajetanalofejibuseg.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e225b935a3---xuworepa.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/dosoge.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_off0000bd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1D 15948 bytes
SHA-256: 3e35ff841951b2375eefcbef7869420ca34bdefce11c6e21c592f67ace3051e7
font_01_sfnt_off0000e587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE587 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9E 10952 bytes
SHA-256: 64e0df65b022d86b141c4966ffd84030dae080120e2b0c3a45a01d636f861afc