Malicious PDF — malware analysis report

Static analysis result for SHA-256 6318e52cc09e38fc…

MALICIOUS

PDF

88.3 KB Created: 2021-07-04 04:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 78d28195aa403b1cca704d2c97648599 SHA-1: 6cb354da83740290b7680d3968da116820602dd1 SHA-256: 6318e52cc09e38fc531decd05bc2e2cca7f8389905ded89bc2e3103d41fc3a89
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites utilizing formcraft or super-forms plugins for file uploads. These links are structured as a link farm, suggesting an attempt to direct users to external, potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ee854392a---suvexejibol.pdf In PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2302e40c69---23100411310.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/df4d350fff9672201aba1a8601470579/matibikaludoma.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/f03f3f451b982233f419275754c46446/49860839736.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202165100124844.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/mufez.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/guzafifedomuwemebemax.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b45c14350b---luvovadexobusekewafosezi.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/92bcd8fcd8c0d5925f296ab13c286241/7542454919.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/c8c4416ce0f0d0354cc3c62801208384/31601426762.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/8b6223e544b40b8b9ee6ff220ef53729/zirik.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11a24d6ef5.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c300a363a---21247627322.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/funofufeb.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/52825859388.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/3dc1fe01f938372b23b4121d44d39e52/koredatujematulizafuzivo.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/79454826130.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/002bc0cbfe5f64084c5281ea79e87276/zinitigijovaxevabaf.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/aef20d2686bba7b0889cbdbdbd9ed7a3/56536533524.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/65891184437.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/1515af98cbaef2a05dcb8a35ee9b1481/susugixi.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/josidorewox.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210629_011655.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708180571bd---70041607312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=the+cast+of+the+hogan+familyPDF 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_off0000f66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66F 17252 bytes
SHA-256: a63e2edd37e9ab9373deb307226360c769944bdcf50f373cbf82b496cba71567
font_01_sfnt_off00012325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3C 10760 bytes
SHA-256: e03fecf74c68c36533d170d075b60a882aa3f3e512b730db63a48143f67ac865

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