Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7fbeaa016a0604d…

MALICIOUS

PDF

70.2 KB Created: 2021-09-27 02:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2a4ba33100fbb0ff6db68003e24aff54 SHA-1: 117f1633ce72c83477d893e0cfef2af2362032bd SHA-256: a7fbeaa016a0604d02b3bedda6618d2db8892434f2b19b00b6ee5ac04f0d39bd
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crewmak.ru/uplcv?utm_term=delia+christmas+cake+icing PDF link annotation
    • http://ke-sen.com/userfiles/file/1631144850.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/jagepijowezapurawilale.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/88648163212.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/bezunidivunewojilabatis.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/45258662968.pdfIn PDF document text
    • https://ms01bet.net/contents/files/48207493158.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/11204398581.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/c7fc4b2e14334dbb1e7d84211e98c2c4/jabevixevidizinetuz.pdfIn PDF document text
    • http://tradotel-riviera.com/file/60998174708.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/jidibonenevuxododiba.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/silebut.pdfIn PDF document text
    • http://orem.mn/uploads/files/tiribuxonogugibamepi.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/mupojufuzikuxi.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/80266908824.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/10706720828.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/bipixexoginu.pdfIn PDF document text
    • http://hkacca.com/userfiles/modinarexozob.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614d6042b7662---78474921895.pdfIn PDF document text
    • http://twilaw.com/files/files/57670425753.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/nizolepij.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/musebeguwo.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/sokiwevejedekexes.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/xufiwasususe.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/gevutanusorim.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302ec048164---disajizapuguxesawububi.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_off0000b176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB176 16340 bytes
SHA-256: 89363f9b8ac5bafd4cb7f7ebc1c50dc47aef0530cd811ad62c455920089b77f9
font_01_sfnt_off0000dae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE1 10652 bytes
SHA-256: 01e012a034a2aec3eea425fb9237c01cf8c1d7b9c8d695f77c306207dca141f9
font_02_sfnt_off0000f317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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