Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a1e7c22cd662e50…

MALICIOUS

PDF

86.5 KB Created: 2021-07-03 21:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5a59f91a6e99b27d0f7365561bea3cfe SHA-1: 0bc18b0f48c518ade29e59121e1a7fbf7976555b SHA-256: 6a1e7c22cd662e50fc612d18fd6ac72d95f45e6bc1d2c4810f943ed2427dd0de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload directories, suggesting an attempt to host malicious files on seemingly legitimate but compromised websites. The presence of a 'link farm' heuristic and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings suggest a potential for JavaScript execution or exploitation to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b85d46d87---29068869590.pdf In PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160796a9c0cea3---24497500718.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0bfbd1ab9---venebapokazovuwerodor.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/g5a5oaal3lpneqsihm6kql81hj/34098608535.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160720981bd7f8---sexemewutegefox.pdfIn PDF document text
    • https://hirurgija.me//files/zijilonumobenos.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160acbc201f957---bawididaxotusimenumibab.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a97b351dbdd---vujibunadozifaxe.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/lobirinunobuw.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/5d32d5fb8b5dc137e40ad0d274c55869/57450262928.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/90336742165.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/77855183966.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086be5244e54---jexibisamowesituwuxakok.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/zagufojuloribemorane.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/18977361135.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/6ua4gjt4mtvq9784f6ntvbnbc3/bimiretosumip.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/60599009852.pdfIn PDF document text
    • http://wych123.com/upload/files/74159245358.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/fipunuzeb.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ba912ae52---61676968188.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0fc52bf66---nativugubigi.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a044e243796---75785123528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=minecraft+free+download+on+tabletPDF 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_off0000f08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08F 17008 bytes
SHA-256: 5469258182709692fdde879370c74be42a87d430c97bdec5df78e5de19e649d6
font_01_sfnt_off00011cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DC 10520 bytes
SHA-256: 56cc7338caa5d908e540be905ad46b4e32fc685df49df8404ae2fd8b5c77abff

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