Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4cf18d4d372aa6f…

MALICIOUS

PDF

94.5 KB Created: 2021-06-28 07:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aab7014473ac95a52bef7e651f777e9f SHA-1: 0ed0fe0dcd5c427785a61c0094e835c500c98819 SHA-256: a4cf18d4d372aa6f37ff86afaf3f073a363c146d16e147b97e18f5a22008cd0e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of the 'SE_INVOICE_LURE' heuristic indicates the document likely uses a fake invoice or payment theme to trick users into clicking these links. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing or malware distribution tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ketchas.ru/uplcv?utm_term=accrual+based+accounting+definition
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa96d6f4f2---60911785374.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da3a48ba7a---rukowebomesunigamigifi.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/4f1157829ebffd868063c7bc1f052289/pumifewajuxus.pdf
    • https://doktor-ara.com/userfiles/files/40381382187.pdf
    • http://marinapogon.pl/upload/file/gefanagowela.pdf
    • http://lnaixi.com/userfiles/file/20210611203539_1661581758.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dadcb1926a---86936805421.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606de64c3d18f---limake.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/cb368edbd7e258e22e9fa62e511915f8/28744217331.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/36c801e69b14a34433f71fe9831b347c/kilopami.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba20cb0bc68---remowejozusuvikafe.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771cf56733b---21962371525.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160866caa8c3c3---mosirasak.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f85c12e63561c3edeb29224c80f1c023/98199232996.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e233374953---45276575787.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4a8949f05---fesowatumolugo.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/10262e722095067c57e680d7763f2d90/13956120162.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/e004723a6f329be0383d571153711a43/mikopamurarisigufuparasa.pdf
    • http://szentdorottyapatika.hu/files/telodawikilomupugaruzis.pdf
    • http://littlepearlbooks.in/data/eimages/file/pifer.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ur5nt4h0e4v587rmdgsb9t2n50/lamemokusena.pdf
    • http://robwalker.net/fckupload/file/27677061092.pdf
    • http://zerosquareonline.com/file/26442293422.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160862f533b128---nenun.pdf
    • http://loveperfectionschool.com/upload/file/3962963732.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5b4.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B4 16164 bytes
font_01_sfnt_off00010b2a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2A 16792 bytes
font_02_sfnt_off0001233c.bin
4406f1f8a9cbb9e332ac1a6c0c3e418a782bb0def948270d0510856b1809cda4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1233C 18108 bytes
font_03_sfnt_off0001529f.bin
b8c10360dcf9f43f71e91671ece6096ea1d5e404bb6e6924899f980a8ac315aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1529F 10872 bytes

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