Malicious PDF — malware analysis report

Static analysis result for SHA-256 209baba12b523afa…

MALICIOUS

PDF

71.0 KB Created: 2021-09-02 13:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a046876c3ae443ecdcecfe86513ac31b SHA-1: 2527344bd281bb2bb4d7d0f4dd92ee820c4df868 SHA-256: 209baba12b523afa3b57e0fa5d4360f5dd721066725c90bc43641624cfc5d711
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a link farm pointing to various PDF files hosted on compromised websites, disguised as a legitimate PDF reader download. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to trick users into downloading further malicious content, likely a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://vitrine-prof.com/files/57942847468.pdf In PDF document text
    • https://urbanlivin.lu/userfiles/files/94376004127.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/c89j6o7uptqt2151l6159c7qk2/97306217079.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/c1c7c1cfb735eb1f6a8c08f103f0547e/14036367816.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078945a92a73---64165176886.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/tuzadugolunopelas.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/tunubevopew.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/64074465723.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec5b0d4546---wogonimuxazizikur.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/werowurojepulasubakeg.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bfe76b575f974b0cfed71d5ab6b2062f/50088614653.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/29292920749.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/kogedez.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/22619026735.pdfIn PDF document text
    • http://flomojapan.com/upload/files/30879997258.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/doxusozetijetu.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/4069976929.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/nigirepa.pdfIn PDF document text
    • http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/22020621888.pdfIn PDF document text
    • http://1carl.com/userfiles/file/kusid.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021063005221870554.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/337a66a7e8b2fcfeaa7fa200a08fa871/zifekagixowasegir.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/88338817346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=pdf+reader+download+for+windows+7+freePDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D6 16480 bytes
SHA-256: f338720633edc2169a908426655ff0725a131c48d86a1f02fd60974596ddc31e
font_01_sfnt_off0000def3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70A 10384 bytes
SHA-256: 50b9636595de7869ca2033e675eba214566985fd37faa0855e61bb316fb83635

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