Malicious PDF — malware analysis report

Static analysis result for SHA-256 161ff57e48f934b1…

MALICIOUS

PDF

95.0 KB Created: 2021-07-23 21:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1da5b666593fa20410c82e6ab7919c12 SHA-1: f84e050a921a8317414412f2ab76ac6b1cf593e9 SHA-256: 161ff57e48f934b16d6d6f7449b6482ed369b322cd41832d5dc37a14dbb683bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external URIs and a link farm structure strongly suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/vobuwabonagoxabokiber.pdf In PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/lozadufilusodixix.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/fularitopobudasukupatem.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160923d016a384---maxenemaximidivekozuxoj.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f77b57a184---54583720601.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/lezabuwapapevo.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/minowoxifojipinij.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/30618530227.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe3df04cc3---jufupologilomumaj.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/zimogijabalaru.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb244ad7332---mitozonedeg.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/29622200593.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b30b0d2c480---2539663380.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/14770404368.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/815651c1aa2866604d520c3d0b5f1b70/pigijodunowiwo.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/cnplvb2738jpo1ji9n57uhuue4/73347147320.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e1860761b---56083911609.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/84758937275.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/18734801846.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739a60156e6---18781823080.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/umlur6pha37o0q2dj3dcmuqvkn/26907528264.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/389b39f85ee1ba303f3f375aaffde798/sapatabomitupeberufa.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/14392182238.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/378634d3397648fce36d3d9e87286fa6/6108622392.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609145350f3f1---78503583632.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec34682433---paxonevatavosone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=johnson+9.9+outboard+motor+service+manualPDF 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_off00010f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12739 17268 bytes
SHA-256: c744c5f1005053a4e8e81c9908cff110607fa7cc10009737c353ee0bb0494f48
font_02_sfnt_off0001546a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1546A 11164 bytes
SHA-256: 84d93cea18efd2696ef45b3628607bd719ed2d4ff616397541d55526b8b78b7a

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