Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53eaca3d3bbe9e2…

MALICIOUS

PDF

99.1 KB Created: 2021-08-12 03:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 748bfc3ffc7fc756923683d293afde86 SHA-1: cc48fa38cc886d234da14f3bdae19bd1261dd9c6 SHA-256: c53eaca3d3bbe9e24858ff89b6efced092b532ede4e91e984e130dd02d47e61c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the structure suggests a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f3d912241a01c1604676781faccb08f0/22718898656.pdf In PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/f5d0fb86466c0568da5a14cbadc8af8d/5144981766.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210604185343_258773791.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9e6a826c---74932240354.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/95da019344c35b63a464641e4e4c3bd9/buvepojibinebexezalatira.pdfIn PDF document text
    • http://crabber81reunion.com/clients/b/b6/b60cf3d631ff247311937b5f15bedc89/File/bavakinuruxesudugunalugi.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/akj6vvgo3aqg4ubgqth3l3kpbd/forenudaw.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/rudubunonefamugaxubagagiv.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/pebuvudigizosexafemofo.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/3a277f3ff77c758c8a3d92e269687289/mikuseviliw.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d529894f32---16628498874.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/mozugufomobezafowupi.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/616307b20649e56a5e68cb7a82cd292c/80433638664.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/j4ccmhknb10dfo66bp5m9f5qj1/pimanepakaroviziri.pdfIn PDF document text
    • http://nature-revive.org/files/file/45793909940.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/pufalisugukamegolijifi.pdfIn PDF document text
    • http://indecomavo.pl/inc/vumitumapomotivuf.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/40100281981.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160aa63c402f9e---30711936537.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/9mmthridu9rsg8elaejd63sbco/22419233377.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/tadekedezarufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=download+sword+and+sandals+2+redux+mod+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000f49f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF49F 17676 bytes
SHA-256: 0f6f3047ee343ccf42f7895b9e477f621e1ab67d6bcca892da15d5e94f05060b
font_01_sfnt_off00010f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F88 23112 bytes
SHA-256: 8930755a43cc4fd7647dce6494a1864d4c27501665e34998bde99363f81ea1ab
font_02_sfnt_off00014996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14996 10864 bytes
SHA-256: e83f22065dd9d68c0d4ec66e9a62609c1f7ddfc25325406527855746eb96cbcf
font_03_sfnt_off000162d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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