Malicious PDF — malware analysis report

Static analysis result for SHA-256 086f443a4ef0fb58…

MALICIOUS

PDF

85.7 KB Created: 2021-09-02 03:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 92f3e6931e37168ec4626e3e614fce5f SHA-1: 9827dee12f9dea0848c97a9d2700caab1d507b66 SHA-256: 086f443a4ef0fb58498f6a617efa0867a8ce6e1eb5125e47bbe328ef83dd4c98
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, directing users to various compromised WordPress sites and potentially disposable hosting. The embedded URLs, such as 'https://nomylo.ru/uplcv?utm_term=complication+of+shigellosis' and IP-based URLs like 'http://104.156.58.56/~web2inbox/...', suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://nomylo.ru/uplcv?utm_term=complication+of+shigellosis PDF link annotation
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/uuge3sv4urqlepjronssusd2q5/sosiwovibogimewuse.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210619030544.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/42115081910.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb04dafbaf---fapape.pdfPDF link annotation
    • http://fittbikese.hu/files/file/xuxamoteparerosegisebi.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/52604925105.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161101e106d2fc---12598933171.pdfIn PDF document text
    • https://usdcp.jp/user_data/userfiles/files/99060118153.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609287a1c6409---rekirisusekidajipesapij.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c89f552e2---19736150046.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/88881757563.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/3d42e2d9fb90d1c57b4b100abebe0859/mazelopexafilosije.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0442b0de56---goterorewat.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/siwevigi.pdfIn PDF document text
    • https://ms01bet.net/contents//files/78280767172.pdfIn PDF document text
    • http://uco-kampen.com/media/files/vuwuvol.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210704042626192005k49r15.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/071827a27c50555d3d21c963b7c676d0/rabesifofukatijoluruvi.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210624090319565.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095d305743b3---lujafabiz.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/27434253665.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_off0000e957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE957 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10169 17752 bytes
SHA-256: c4cbb2a50e2c9b56807de96bb97613a90497ef4a93fa66872183fff796893c45
font_02_sfnt_off00012fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FED 10856 bytes
SHA-256: bee61bf62803d5c52fd96d085b2c68435524c6e934e942c925812e21399e068a

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