Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc11e20919dd46f1…

MALICIOUS

PDF

75.1 KB Created: 2021-09-22 14:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4adc9168e90e1b172d6dc4366f0740e2 SHA-1: 7cde62ba9cd2c5e78871c496dddc941f134a8265 SHA-256: bc11e20919dd46f1bdf9282d320f366d44d20237b8c252ef555ac0357f491339
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous links, including one with a 'utm_term' parameter suggesting tracking, points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://oniceh.ru/uplcv?utm_term=octopus+app+apk PDF link annotation
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/2ug5t5tcgld8i9pm34kscvjdp4/kunuguwibasokib.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/petexajinizoxotibisodura.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/0214ace049de71bc3f546b4a0575afe0/21835006849.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/riwisamiwipadetiw.pdfIn PDF document text
    • https://suksesunited.com/contents/files/vixovogafipewebomi.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/61506118781.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/zoxazasimigufimoreva.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a4a5bc377---8899853810.pdfIn PDF document text
    • http://devison-matras.com/upload/file/nemugava.pdfIn PDF document text
    • https://parkettworld.com/upload/files/naditiwitimod.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///wuzabuditivuteki.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c391eede1---43448966470.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/17622926348.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/98587730511.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/18852752449.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/47951332387.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/56510332876.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/kazedusaxoxokaro.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/nameguwofudugij.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/nepubomu.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-11/20210911104805281018.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/safutezinofuweruxakodudit.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210905_1D3B7E65FBC7C573.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_off0000c7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B0 16076 bytes
SHA-256: d9be9d5566b1859c3fb9ef18b9af928e01a78887bbaef60f96776183797348c4
font_01_sfnt_off0000f0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A6 10108 bytes
SHA-256: a28ac127b9e5e39763f55463042505baf4408f8091ee76eb6f966ce9d215443e
font_02_sfnt_off00010774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10774 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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