Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e35b3f99d5fca72…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 04:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2fe8890849b7dd5de7985327d4219cc2 SHA-1: a224bbb13949cdf6f165f3de17f887a981dcf473 SHA-256: 5e35b3f99d5fca72a0f257ca7d6be66cbd807a45c3e2c92b5d7426e1d998b5e0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external URIs and link farms pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crewmak.ru/uplcv?utm_term=blade+runner+2049+movie+download+480p PDF link annotation
    • https://sharjahcements.com/images/bulk_images/files/wilikuzugevezonaxido.pdfIn PDF document text
    • http://voijin.com/userfiles/files/34767856073.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/xobim.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/xajedopulogezebiv.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417d0d0091b---96024702368.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/gogojamefelomegijube.pdfIn PDF document text
    • http://secretinvitation.net/images/files/31106320004.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/mofenesejinirilas.pdfIn PDF document text
    • http://alkanboya.com/files/file///vugarudek.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/63243776932.pdfIn PDF document text
    • https://j26clean.com/upload/files/35833971436.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/tasakexutuzavapuvulolus.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/13bd262d3331b12a519e3dc0afaf2eea/jajovabebuzesojuvobi.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210904131810_kb2ms0.pdfIn PDF document text
    • http://briztravel.com/upload/files/fisagaratitezaguzik.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/67229322308.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/vugupelebeb.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/99604093117.pdfIn PDF document text
    • http://1carl.com/userfiles/file/nudona.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/kuwoborul.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360065ce21d---94687183887.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/fobujonoposedejaduramitot.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/79404418870.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/vabisosuvupusikoduf.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_off0000b233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB233 11288 bytes
SHA-256: 07380a2170c5d311340a2b0621f6044657f7f5d372d1ecd0202a31ad36ecd6fd
font_01_sfnt_off0000ccbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CE 15076 bytes
SHA-256: d4e7fc78ba2ba4fd730ebff70e54f0926156ee418f21bc1657f0c277d78a7393

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