Malicious PDF — malware analysis report

Static analysis result for SHA-256 0277e85bcdf9ca86…

MALICIOUS

PDF

82.2 KB Created: 2021-09-02 08:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a880a1c6ab9c5a3e3af9fceb487de742 SHA-1: 5612b2137eaddc8d494257380a15fff2acf5c9fd SHA-256: 0277e85bcdf9ca86a0344ab33ffc7ffb84281269af7fc14b18853c00badea20d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://legalinet.eu/userfiles/files/kogogidogowupamibeteka.pdf In PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/wijujow.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16076b733b7279---xajew.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610e4475eb8b1---64464533464.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16119099708018---19317992051.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/l7j31qm6lo5t10s2on1pvljh47/84534755593.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5f21c965b---88349142522.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b72b656c---retikobogi.pdfIn PDF document text
    • https://ebooksweb.net/files/file/levunegesumedox.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/qb6r10j16tuni5f0gbrktnk8kj/tunuj.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/69fb8eb65c602e89fcb14c26294cb1a3/bujejutatuvuvefajazaleri.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/48985736482.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906fd0f306f---20101280277.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/noluduju.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/goxufi.pdfIn PDF document text
    • http://bfo-walkforhope.com/clients/e/eb/ebd0efab9cd97e953e90891d9eec7aad/File/62788916463.pdfIn PDF document text
    • http://strandedtattoo.net/file/zefexutagal.pdfIn PDF document text
    • http://www.andreapondika.cz/file/tijug.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021729142146.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e51e7022616---fevabefagukozikupomowo.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/617b423426379c320f1dd8385bc4e248/51623098303.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c413127d834---zitegedidewusadajome.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f07132b6601---55744098276.pdfIn PDF document text
    • https://flying-vikings.net/UserFiles/file/kusegedarelupebom.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/senewodujojirolur.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/zepepatalorerokotonuto.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077a73d1c04e---desosodanuluxudij.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a835dbef0f---xibenokevadegig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=standard+notice+for+moving+outPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF593 17176 bytes
SHA-256: 04298cdc53485b30c557480b15dccd26060a322edc1ee46342e521275b266389
font_02_sfnt_off00012233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12233 10844 bytes
SHA-256: 7f4796d24c044606524f2c8a91b3a41aac34ef2ba3ab1061dce85b2f2e51e913

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