Malicious PDF — malware analysis report

Static analysis result for SHA-256 77acb232c247e156…

MALICIOUS

PDF

86.5 KB Created: 2021-09-01 05:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3afab3e1ee4e62ed0f1cb2893d9a8419 SHA-1: 5393eb6eba736502cfc93ace73909e4cde401ca1 SHA-256: 77acb232c247e1566b6864e3422377ccc639ea150e6703ea9d3d78aac98b02d3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, likely serving as a lure for users to download further malicious content. The presence of external URIs and the overall structure suggest an attempt to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=how+to+create+xapk+file PDF link annotation
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16098777255b0b---91072992832.pdfIn PDF document text
    • https://ibextrail.com/editor-images/41261421154.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/foziwawa.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/40916647614.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/49485853112.pdfIn PDF document text
    • http://bakerfamreunion.com/clients/1/13/13be4b03bdabdd3a133c3ee64ed6201b/File/88828535469.pdfIn PDF document text
    • https://zahnersatz.pl/userfiles/files/kamupijapikoxesobutozolu.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c962b86e0897507754a1d06da602808e/semag.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/jiroderi.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa711bc24da---penonosup.pdfIn PDF document text
    • http://allycatering.com/userfiles/26911267966.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/01a23cd2d1a1343c6494eabaa94f2b44/xujivuwin.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/nadis.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/86385237823.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/76131207813.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/82115343906.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ae49441b139---zasezalizuro.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/30555090968.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc4085d5f05---lelosokokorasotesi.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/barili.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/5b4c5af0efd2cbe6293803477557e898/51957039938.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/bitibetafel.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/liraro.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607dee88216d3---66800783976.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/bcc1eb9ab4d8b77bd45481e89867a80a/ritere.pdfIn PDF document text
    • 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_off0000eef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF5 10472 bytes
SHA-256: 7e59690aa22cd90f541caf104d2452642037745bd64fa4ce46fe69ed398b8537
font_01_sfnt_off000106e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFA 18008 bytes
SHA-256: 65ba093f3275c64d33285878bc7a4c2b5a8195cf96f7e974ba9be388b84d4aac

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