Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db629789c045832…

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 06:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 08d8ffe9d2346ecf89189d8c70e3905e SHA-1: 897944d9aa47d8187348dea3469d6e9794e1dbb2 SHA-256: 8db629789c045832645301ca099c39f31411ceba1251ce32e0cdc331a296cd7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URI heuristics and link farm patterns suggests the primary goal is to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=gold+rush+slots PDF link annotation
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/lubirudebuzovusobobuf.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/62687684778.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/66517074188.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/ganufabimitesubidiz.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/18889693112.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/mowekojumid.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/lokasakinemokemupazetoka.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd02002b8e---jopulitamigonibi.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/97100140874.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/19736170269.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/713012938.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613082985b244---35144537662.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/zevoki.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/21260100395.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/51529229397.pdfIn PDF document text
    • http://lobi.md/userfiles/file/70800248043.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/kipiv.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/bujawojarigerit.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/ravufedirab.pdfIn PDF document text
    • http://dptour.net/bot/ckfinder/uf/files/30496885739.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/rimuregawasubivimu.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/55082105982.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/62769981253.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bce22057ae---dizejefokos.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/311687016.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_off0000e892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE892 18372 bytes
SHA-256: 3d7b5526160dc584fd5c49d172aab7e384b3a08d81e6808160cecf21ed20edd5
font_01_sfnt_off0001185f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13075 9992 bytes
SHA-256: b77e19e32cb78075aa3e2ce0b05da3476ddc3053c200e856817240ff479e0218

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