Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ed49b4ffa9d117…

MALICIOUS

PDF

112.8 KB Created: 2021-08-02 20:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ea63c3863fe259b30ded1f27f6f0b4d SHA-1: 16f36d4d361bcd4130dafbd8928d167f70ddb16d SHA-256: 90ed49b4ffa9d1177ffa3575fbd4a5b5e9ffdd8ef907b4839900abb2ebcfdf90
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable domains. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76861028457.pdf In PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d344d2f40e4---89835098687.pdfIn PDF document text
    • https://eclearusa.com/images/file/25970803309.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/4967972c16f0e8ed6c8904c9b7b48eaa/dupupidefepogi.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/rogat.pdfIn PDF document text
    • https://birutelorasin.com/contents//files/76266690242.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cd982a37b35---nopigi.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606f112fbf879---vijoronepigo.pdfIn PDF document text
    • https://clickbox.ro/images/file/mereranowuw.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/b20f933b904e57fcf881e38e2235f71f/15953438661.pdfIn PDF document text
    • http://djpress.pl/Image/files/datakufadif.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/kuronopilofifo.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9358402b6---javelet.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210721_090803.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/71ada4dae7b3716facaa6f757b0c66c6/88791149469.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/vekewiderevufubiluz.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/57122095894.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/35e62f32b4fdd898077f9e3d4a166b24/59317198480.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/jofanerixajodarilebadote.pdfIn PDF document text
    • https://buka.ru/sadm_files/moliwazim.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/195256253.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/55356911341.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/f5fa6d9ebc1fdc261c4fcbcab67bba97/zasowedilikijepelopamuful.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=skyrim+requiem+seranaPDF 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_off0001572c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1572C 16972 bytes
SHA-256: 8f2c6294f3d153daae31b565eab904d7572370d993b7a3ecb888de3c7166f07d
font_01_sfnt_off0001837e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1837E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B95 10532 bytes
SHA-256: ba03681dc63c17263e39df47c6a3f4ef8cf4ca5886f418b793995b0001a3157e

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