Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da617675cff6c03…

MALICIOUS

PDF

89.6 KB Created: 2021-08-04 21:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79367be5cec834f14431ceb1006b078a SHA-1: 1ddc15549417400f7731e90633b524f238e72cec SHA-256: 5da617675cff6c034c123697c8e43122cf51d5640a917a6862861740aba5020b
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 websites or disposable hosting, which are used to host other malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF link farm heuristics suggests a deliberate attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bunyaminerdemir.com/resimler/files/pubikanodusewuzezuras.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/guzavapozowonidifibu.pdf
    • https://amursvoidom.ru/media/files/sudoxamisulokufisuxiku.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/790a1954c2f854d9cca2937545e47012/votuwovo.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607766475ebc3---60041354014.pdf
    • http://sro52.ru/uploads/files/33843024057.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/b59df056095b6cf01c520bcb94b1084e/moxaniguw.pdf
    • http://tasarimak.com/ckfinder/userfiles/files/73862392751.pdf
    • http://architettosirocco.it/userfiles/files/fiboxo.pdf
    • http://akcjonariusz.com/UserFiles/file/vateradezavisabapa.pdf
    • http://robinsonfamilyreunion2021.com/clients/7/77/7769cd5c98d63cfb9738ae2db1c5c42c/File/86502497615.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc2a8e98f6---wajefonolinivul.pdf
    • https://prestinieurope.com/userfiles/files/sojasipo.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be66808b029---vusakif.pdf
    • http://studio-castiglioni.com/userfiles/files/fomagabatukefejamesufa.pdf
    • https://folklorebridge.eu/uploads/pictures/files/semopemijafamesidojixebe.pdf
    • http://goldstecq.com/userfiles/file/43114354432.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/49baa7ff5458e92f59faeca7ce0ec4d1/gobezalinadanejodof.pdf
    • http://zubrcup.by/files/files/37252866810.pdf
    • https://kudamatsu.org/userfiles/file/supesetilot.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a9dc9f77b---mixosozixonisig.pdf
    • http://kimhoatra.vn/upload/fckimagesfile/3632362559.pdf
    • http://shuswapladystriders.ca/userfiles/file/36690912123.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=download+minecraft+bedrock+edition+pc+free+windows+7+32+bit
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3c2.bin
e048508b1fefd553544058d495d9d89287f72596822ed229ea8b5f881dc3b3c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 18056 bytes
font_01_sfnt_off0001231a.bin
184123e8b32ca3424a83a975e45abcaa07517b86c70013ed8b7c563033660c8b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1231A 11440 bytes
font_02_sfnt_off00013e07.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E07 16792 bytes