Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd6aa4b8fd04346…

MALICIOUS

PDF

77.0 KB Created: 2021-09-02 12:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f38f70dc1e9f31ff72843fad58b606c SHA-1: 54dd05ec076475fd215c8ef9a71b5aea680753bd SHA-256: bbd6aa4b8fd04346e27264d9526187e428c5e9913fb24a091c29a30a5a95b75e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary attack pattern involves luring users through a malicious attachment to a site that hosts further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e62245e0e1---30891561714.pdf In PDF document text
    • http://www.pattyn360.com/upload/forum/files/nabigekuvemew.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/turumarovupapefirelewijup.pdfIn PDF document text
    • https://gotamsui.com/ck_imgs/files/diwad.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d03dcda8cfb---36560863044.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/vivubuzojuzo.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/xavebenodinoxugenanojili.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/981980205.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f59d692048a---temikixetujebesonevasi.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/7ud0eer04896jcidjvs4bu2424/2079061318.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/21045006394.pdfIn PDF document text
    • https://interface-graphique.com/upload/editor/file/ximumazamatoxubureduxofo.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c627590a433---wopesugemazokeju.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/52154659904.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/gepigazo.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/76684060009.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/37908136264.pdfIn PDF document text
    • http://millecolori.it/images/file/susufakulujoranejimusudij.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc1efe95a6---rogadogesiji.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/gcuk7pd72dm8hbt1dlog8qon33/bowaze.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/piraw.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/99828667037.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/2671901495.pdfIn PDF document text
    • http://goodmix-psc.com/userfiles/files/95132837359.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f85b4e4fa---xerideve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=international+carrom+federation+rules+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_off0000c9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DC 10832 bytes
SHA-256: 8ff8ad04e1b97789a6f5c3cdbc6e8173f4588e9e4a59eddd4d56d14051db5612
font_01_sfnt_off0000e2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE4 16944 bytes
SHA-256: bf10aa8935f1e5cc2ff7fe70069cb0890ef139ce2936017c6b0873ad4201c88f

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