Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac7fa52975da237…

MALICIOUS

PDF

81.4 KB Created: 2021-09-21 00:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0a78597150e95a5e3f99b7f2049130b1 SHA-1: f75896d3225106c3586d59477b56ae18c64b922f SHA-256: 3ac7fa52975da23755e8547d883b243f7853b0ac335a8eab1306d773458ba925
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous links, many pointing to disposable hosting or compromised WordPress uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript and the nature of the links suggest an attempt to redirect the user to a malicious site or download a secondary payload, likely for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://inwebjor.ru/uplcv?utm_term=jak+rozpakowac+zip+na+androidzie PDF link annotation
    • http://autosoftware.company/autoresponders_images/files/38982398809.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/681512801.pdfIn PDF document text
    • http://innotack.com/userfiles/file/tuxedafebav.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/79759801882.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/pekobamifi.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148fa5a9a6c5.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/sekakejezakugebexap.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/82771299595.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613e41cb82a75---55657306085.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/rabume.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/51557374591.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/0ffs1c26s9mbfftmrfhao08klj/lawujifipiberutiwe.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/kibafolilikevupo.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/648048332.pdfIn PDF document text
    • https://zooiguana.pl/app/webroot/media/files/widexikakete.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16133dc037bc4c---67188190940.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/40950979766.pdfIn PDF document text
    • https://krusomying.com/data/file/senowopopuguro.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5c549bad3---16652376848.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/73856807220.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398358a50ae---jukadajesudaxarawonaputo.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_off0000d9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BA 17892 bytes
SHA-256: 109cd77e2a657d81af3e297ac687bce5c7e60ecc3e91c1b8cb6393ea254ab8b1
font_01_sfnt_off000106a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC0 10424 bytes
SHA-256: a40934f0f3dc5dcb0df050e3b871ce6c87b55d8431a56f9bd45a47c0100fa326

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