Malicious PDF — malware analysis report

Static analysis result for SHA-256 45fbccf5823f930a…

MALICIOUS

PDF

87.4 KB Created: 2021-09-06 07:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b317e42e5256add1636fa1a6c4fc7bc2 SHA-1: 63ccae424090773810ba7944626bb372c6c39d1f SHA-256: 45fbccf5823f930a7564a5de3f91ad0f8fb7158053551e6510b7e9345b633cd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or spamming campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://queure.ru/uplcv?utm_term=ios+create+pdf+programmatically PDF link annotation
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/d66e33938fed72d3ddc1477231b5ce31/newasesodivunawug.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160adbe15451fc---37949714436.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/nokorezofawusevexuxipu.pdfIn PDF document text
    • http://vhz.cz/user-files/savominofulakawu.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b151401c195---16863673020.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/29533005715.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/vofixarilufuzaguvekojum.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/36746992612.pdfIn PDF document text
    • https://gangnampools.com/contents//files/poluvuzisetururevezavevom.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/58e761898cf101c76886f54dc0dde5d2/43708730870.pdfIn PDF document text
    • https://spacio.hk/attachment/file/51963544908.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c239c2ec9---tetupuvid.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/vomoweginumosavomedulo.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/popebigomewodu.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/pafojixopirerekujedaf.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/74086164014.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4eb668dbc4---vusepakuvivopolugutol.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6dae2a3ed---1929356454.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/zadepezelobaf.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/welinuwobijimexinawiluj.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/rewulexexasubemixisewulu.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/mqbpua5caehgbi6b3j225o3dvc/29124574591.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/88160492589.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_off0000ea45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA45 20228 bytes
SHA-256: 84bc256026c4a894e1e30699a98bc069000ccd1f8a3a0165a799c0ed8994b00d
font_01_sfnt_off00011eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB4 10924 bytes
SHA-256: ac7220331e816a437a261f729f813c8b1e5df6d506397a58c40d54d099755d93
font_02_sfnt_off000137e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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