Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a2b070316d1da8…

MALICIOUS

PDF

83.9 KB Created: 2021-08-24 11:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 33f1ae06d067e6dd6ab9e6f2afdd7f33 SHA-1: 4609f469938482dd6038f77724807452d6bf2e0c SHA-256: 11a2b070316d1da8734db83a214cf097dd648ec4142803f65f959f9404dfffb2
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to a variety of websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host phishing lures. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://coretry.ru/uplcv?utm_term=how+to+cite+indirect+quotes PDF link annotation
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/1b3b24dda62acef5831b53a12db91784/13501230303.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/6b045774c94bb4217b1853f9f3b3d1f5/76812059776.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/juxidetakinevevomoxu.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/79392546782.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/38825066107.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/raboviwowofipewiwijotem.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e9057dc0b---videtexinajo.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/16978351745.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/59580686276.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8dce1c23e---64154114760.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/kiviwefuwokasu.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f94edf794---31236074519.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/xuvebigodebuzu.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/61795553166.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/84174275334.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/51213671376.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/d7bd84026d03f3f6bd38c0ab47eaef02/21774776002.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098255ad9a12---89020361990.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a6eebd82b---bozutomivanizibuvelowak.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160bf008b82f35---42323002540.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609778e1bd47a---4836034160.pdfIn PDF document text
    • https://hoongnau.com/upload/files/47671046953.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160751d9ea3256---76235924101.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/lutexamedogapegoviluv.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_off0000e652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE652 10476 bytes
SHA-256: 94c39675dd2f757b3b6edee5f131ea0715b9e4da7a885955629ed6ad81e57ea4
font_01_sfnt_off0000fe0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0A 17420 bytes
SHA-256: 79bc204387189fc37f6a5d4d1404749f229e144059f19887ff7c289b02a6403b
font_02_sfnt_off00012b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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