Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9405a73215364aa…

MALICIOUS

PDF

85.7 KB Created: 2021-09-04 01:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fbe253e50346667a4311ad31b26418f7 SHA-1: 44be78a9cf59cbeee929fe8326ead53d1fc98abb SHA-256: b9405a73215364aab5d14b0026bbdf39f422f069703d956f10a4f0d35a1a5d6a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. These factors, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly indicate a malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hogies.com/includes/template/uploads/file/zanozuvexozodiravutag.pdf In PDF document text
    • http://regcureguide.com/files/files/78076220796.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/bavukudenewawipumavexenuf.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b57c63d42ab---89417197743.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/724bd1d96e79a9c89763e18887c2904a/pajelex.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/jobuvawagazisukuweg.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/fbdf2f899fce2ae27c7f9aa10cb91286/53152467867.pdfIn PDF document text
    • https://ijpdua.com/contents//files/41531563608.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/7ded08f71f7e8a777d944385b69c9b5a/diruxubutegeravarajebi.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/piladubuvuw.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/33141560834.pdfIn PDF document text
    • http://dogable.de/userfiles/file/roguser.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/98777595110.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b17a6726e9b---96864900424.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/22231879809.pdfIn PDF document text
    • http://boxethai38.comupload/file/dabiwitinuwejubaxajam.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/vagunipuwafeniwimew.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021071409070652.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/80ersoshmr8m77346bq3h21leq/gupepu.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210704_34CC0C5DA378AD28.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/21833993553.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1qh0qb3i7rciq19c1454u6uekf/lapivakiremo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=resistencia+de+los+materiales+libro+pdfPDF link annotation
    • 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_off0000e2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB9 21108 bytes
SHA-256: 6ac00bf7c2ddb6885477a56029120a2af5ada9e2828a12690d933e34b7e5e44d
font_02_sfnt_off00012ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF7 10968 bytes
SHA-256: 17dbf93d1627483e9659c18ebde80a98e1272745eb583016daf75acf21592c1d

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