Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8bbe9d473556703…

MALICIOUS

PDF

81.8 KB Created: 2021-06-25 12:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e0fc6da16102720cc89aac26f0e5a81 SHA-1: 2ec99c2b1c547e6773ec0c95623313d78401bb4e SHA-256: e8bbe9d473556703e8d1631e01c3edcaffa4a4d9b41270a624025e01be13e0d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://amy-tsai.com/images_express/userfiles/files/6973215555.pdf
    • http://mclarenquartz.in/ci/userfiles/files/woputalamapexi.pdf
    • https://dpengineers.info/admin/userfiles/file/15200675047.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/jp93v6duv4086v5f38frqr398h/moxuko.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/9c1j53pd79coss0igg9c01q8qs/joteno.pdf
    • https://speculatio.in/ci/userfiles/files/fujoso.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/67fa1cba9b041c45f099200e3c6e6cad/64140505080.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b33978cea7---ritali.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-14/20210514004752997096.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/2a3e460d191afbad5fac84af1f9780f4/52156420374.pdf
    • http://ok-poland.com/userfiles/file/rorifegob.pdf
    • https://alutat.com/data/file/60572496425.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160869bdf15b36---89417992307.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/othh3pkbiihjaj4qm4tl5r3hg5/wukotemekubakegiwetaxove.pdf
    • http://hersheyhigh1981.com/clients/37302/File/54774905969.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+ultimate+guide+to+sat+grammar+4th+edition+pdf+free+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc1f.bin
88d4d2c05940d131f584c16490290ad6fe89cca14b7b435c5ab7c86749db224b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1F 11172 bytes
font_01_sfnt_off0000d5ee.bin
9d99b5f802e62c0826dec2ed32b4572e751c0974973afbe3469611badfb8d53a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EE 17616 bytes
font_02_sfnt_off00010325.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10325 16792 bytes
font_03_sfnt_off00011b36.bin
12b20ab9111c281d758b44d4b430ac86fa76371a658c452e7401201c50f9e164		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B36 18204 bytes

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