Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9b2edc301b6dce…

MALICIOUS

PDF

76.9 KB Created: 2021-09-20 19:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d6764d91abb0a1dd0350f327b0fec3b SHA-1: 559080f1ab005cdf630da64ae4384671ad7f7517 SHA-256: ab9b2edc301b6dce1965ccb98744b38a6307121852f034df7837e538eda942a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The embedded URLs and the overall structure indicate an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://georeno.ca/userfiles/files/41532913204.pdf
    • http://zzquansu.cn/d/files/tezuvinaxinerupovuz.pdf
    • http://biosurfest.com/userfiles/files/susumixurilitonam.pdf
    • http://studiofranzoni.eu/userfiles/files/wibaguzawaw.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/h6di1minfu5qd4jp5kvk35n7tf/sakogexodinizazer.pdf
    • http://rickgrisolia.com/userfiles/files/totupalu.pdf
    • http://vetcasatenovo.it/userfiles/files/66995112507.pdf
    • http://debsecond.net/UserFiles/File/22182854259.pdf
    • https://www.indoorclub-informa.com/boletines/img/file/vasid.pdf
    • https://mkart.it/uploads/file/52940200600.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16148184563f39---86524517089.pdf
    • https://nenmongdangquang.com/upload/files/54408488631.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/9c8f3cc7a25c5bcc11db5483e874ce33/wisimivube.pdf
    • https://rarahil.org.np/ckfinder/userfiles/files/41070673500.pdf
    • http://jobsandhi.com/uploaded_files/userfiles/files/53164705267.pdf
    • http://aaronandanthony.com/userfiles/files/87627345989.pdf
    • https://easresidence.ro/app/webroot/files/userfiles/files/69212843927.pdf
    • https://tenshinorchids.com/FCKeditor_upload/file/bemerowusilu.pdf
    • http://amy-tsai.com/images_express/userfiles/files/pijixorifarakujixojopak.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16147e266c755c---xevul.pdf
    • http://stickerbarcode.com/file_media/file_image/file/23153935424.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/7fb596bf7623a6b17b0af57af2be2072/bezolosipiretivumebelopi.pdf
    • http://hasomedia.com/userfiles/file/fojizikizuroduxemiwusozim.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/d5971366deb7fa7c6bc111916f832a7c/4879622717.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=vivo+v11+pro+system+update
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2e6.bin
067598388f982aa2ca80295828ee0b5c11241a332f17b4f35069173a25c1be07
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E6 18828 bytes
font_01_sfnt_off0000f370.bin
32361290dfb63ca6bc2ab8c2efa293873714a66a8c9876ca80397fd6f0f83403
pdf-font-stream PDF embedded font (sfnt) at offset 0xF370 10704 bytes
font_02_sfnt_off00010c31.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C31 16792 bytes