Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f35d855311d75d7…

MALICIOUS

PDF

85.0 KB Created: 2021-07-13 22:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4525f6184b6ad9a0eefe805dd522b566 SHA-1: c44131d0a844d0ba2ecdd8d7b9cc2325807ce3c6 SHA-256: 2f35d855311d75d7f4ac29d4f0b245637dbb1baaa033b28e5a0cc6a2bc6bab84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://aaaexpressac.com/userfiles/file/62216131281.pdf In PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/228826da42caede3397858a0453494eb/jaxajukarujilifa.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72acb1aaca---futorotigoz.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/42795310294.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b8202b995---30690697925.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/27559a9ecc18af8da918e9a584bcf1ef/18977167402.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/31fd26432afe0a5d849721ce0f65789e/86943501164.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/sabupavorijaxoj.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c55a5bca1---78953804399.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/12657124551.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb57140067---sajudiwetibopuvusize.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/11f654779e1ce30c19441b6fab98e252/55328720600.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a82733316f85fa5983e34354341ca80e/vevabexovafi.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210705010119.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/fagenagakasu.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/sgla3a003nqlebvkse80kig0j3/dudijakujuduputubo.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20216171846454069.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8682e29954---tenogepulireli.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/39504162336.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/baxefupobufaberisa.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922a423534e---livumokuruvemerukam.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/judoreteworazasegapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=why+do+you+not+eat+red+meat+on+good+fridayPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE956 17200 bytes
SHA-256: 868ec772c1c22fab0d7643cfa9035d743a0747c81b98d20e63654307b71a8fbb
font_01_sfnt_off00011618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11618 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2F 10792 bytes
SHA-256: 24dcc4f55d0770c67a634e51ebcb1e67eb0f392ef72bf3b3d92d4919ce0e7a83

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