Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f1559447aacd52f…

MALICIOUS

PDF

84.3 KB Created: 2021-09-02 14:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 995e75c1b0df9bb40e803ed1098188de SHA-1: c0195013e47bbc3e6625181ef19d8f0df72996a7 SHA-256: 1f1559447aacd52f2584f413ca815b111af20014a45ad1f6e9f445ed636ec476
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites. The embedded URLs, such as the one hosted on 'drinkandshrink.co.uk', are likely part of a campaign to distribute malware or conduct phishing attacks.

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 http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e95a23bc530---xadew.pdf In PDF document text
    • https://yellowstonewildlife.com/ropowamirijejet.pdfIn PDF document text
    • http://aven.su/userfiles/file/sifevajefunerufujuzizax.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1b8761cb2---saxurevurupezolav.pdfIn PDF document text
    • http://pvvc.cz/files/lisirilawemuz.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d9d258e53ba---23137197264.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/damokifuzo.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a465dfa1729---2397354535.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/47932380479.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d8a405862---warevizawikozavewe.pdfIn PDF document text
    • http://computerdoki.hu/user/file/jefujoxunovivife.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/jabagigaxafowu.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/tidonomijipolabek.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/kobemagewatukineti.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/rigeni.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/53536141031.pdfIn PDF document text
    • https://nistd.in/userfiles/file/tofowobodojezerakof.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/nafepaniv.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e429c3d3948---wapegikidi.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/4892107286.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/bogovarelawupizanuro.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/dolulotejugare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=pdf+reader+for+windows+7+latest+versionPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/25c7417793800ef829ace4c7075bbc7e/bonipifofoz.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_off0000e5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C3 17868 bytes
SHA-256: a6e56c25168bb70e1e4138336307e327e3f610eaf188ad94ff3accc910da8892
font_01_sfnt_off00011381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B98 10548 bytes
SHA-256: 781399455b5e04c514cbe0292747e405cf71b8c316647e3460500e43bbf5ac2d

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