Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd2c240baa6062e2…

MALICIOUS

PDF

81.4 KB Created: 2021-09-23 18:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7f6b8377b6d96f4bce3e5163c3d8b168 SHA-1: a47486757d4f1bee255e0be104c89556d6321ca1 SHA-256: dd2c240baa6062e27d5a31129f334016f64f069dba2112c71ebdb812556f2ed6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded URLs, such as 'https://archism.ru/uplcv?utm_term=gboard+keeps+crashing', are likely used to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure and URL patterns strongly suggest a phishing or malware distribution campaign.

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://archism.ru/uplcv?utm_term=gboard+keeps+crashing PDF link annotation
    • https://bakotech.at/uploads/ckeditor/files/gavas.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/tuvozewofow.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/taditejekafefotamivewodar.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161409e84ef252---98922613412.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614314b9df6f0---20552904339.pdfIn PDF document text
    • https://miet.hu/kepek/texivojuxodapefi.pdfIn PDF document text
    • http://esteel.my/userfiles/file/7750122213.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/digogutug.pdfIn PDF document text
    • https://zagi.hr/files/fugoxebup.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/18577376636.pdfIn PDF document text
    • https://nyig.com/files/file/gulitatoleposino.pdfIn PDF document text
    • http://skolky.info/foto/images/file/50132723093.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614bfd054b0ec---82075423385.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/zanukanufatujeganokovavuj.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/tl12158u432b71dh8ro34ul277/35884737004.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/tujuwesixopiwikijaxola.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/iq3hvbfitsbekf6e3smurq87o1/kowagovezepozelimivup.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/zebusi.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/lemegiwupe.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/45727148910.pdfIn PDF document text
    • http://falerisztika.hu/tmp/midirotavig.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/wifekadugewumixekimigizu.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161478a1bda917---lizufimevu.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/4693140260.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_off0000da0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0D 10920 bytes
SHA-256: d11d4c943b527158ca771b2e629638aca487c0aecc671ab17db241974b630594
font_01_sfnt_off0000f2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D3 17348 bytes
SHA-256: 12705811be83948980f2fa258d6be42ab4979720edc364be723af33d7d7f0944
font_02_sfnt_off00011fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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