Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1587f476901062…

MALICIOUS

PDF

81.9 KB Created: 2021-08-13 05:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 08223f41b14eefa96990150289b9e574 SHA-1: 1ddfccaf637a4bed084511e3a2caf934fbf1f2da SHA-256: db1587f476901062dccc85e31ebadbf3ae723fa81b25d700dfaa822a500bb538
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and potentially engage in SEO poisoning for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://pharma-tools.eu/galeria/file/95358046040.pdf In PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/068ab4184b90a39ff5a29e9664e6ab50/gepujasezaw.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/2612686154.pdfIn PDF document text
    • https://mmszke.hu/files/file/kedovesebil.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/64840337310.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/nowirogilibasikekuvatiz.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954eb396fe4---kipixelewevojiwan.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/9593a4dd1c52d7e1b36ce44b70356cd2/40158015595.pdfIn PDF document text
    • https://basisangka.com/contents//files/lirujekibe.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/57559141864.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/lamubebafiganipupej.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16085678de7e30---73133809533.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/kerilebepababozaw.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/muwopelupasakovuboliboler.pdfIn PDF document text
    • http://arablift.net/userfiles/file/31726440514.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/72300962565.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/6b58b120abd13cbffe151a6613b3a1df/67288139101.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/i29s2b1sla6r46j5hdh7rk7u2c/jalimot.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/ggv9b5ht3ev95c7enjgebr7bfv/jirajilotibiguvuw.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e8b493aa2---vigumuvib.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/260322412236.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/u51uurhh1cgolv8pqvoetd27qp/81539405563.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/85527453766.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16086a81da6a4e---46434407291.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/59226881284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=exercices+corrig%C3%A9s+m%C3%A9canique+des+fluides+hydrostatique+pdfPDF 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_off0000d7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A8 17080 bytes
SHA-256: 7ec60f64f7f1dcf4ba100b07dc76015ae615cd2a849029f013e8508da8f27992
font_01_sfnt_off00010384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10384 11668 bytes
SHA-256: 5d22f476f20213f7c3f1cf1aeeb2de91c4f7398bdc50baa488243e79622cdd00
font_02_sfnt_off00011e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1