Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da9b787afe57eae…

MALICIOUS

PDF

77.4 KB Created: 2021-07-13 23:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 37fef5c37cc7e7c17f6dc943064ff923 SHA-1: c72dbe10bfe207464e860500d7ff6b0c956b4d26 SHA-256: 1da9b787afe57eae267a052eaea088349f57e5d4b23e76faf063c6caeb7c1ede
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF being a link farm hosted on compromised WordPress sites, designed to trick users into downloading further malicious content. The presence of a 'download button' lure reinforces this phishing-like behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • 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://archism.ru/uplcv?utm_term=theory+of+cookery+ebook+free+download PDF link annotation
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef2352067c---84472171876.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894407918f1---zofuvara.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/fekararapibisuxifelubemes.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/fcd4547d1f8ef0c0159270841794dc99/jajopewotaxizovemi.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/32e1e6c633fdadf355f73dfb7c0fca45/dekesutuponimukizabewur.pdfIn PDF document text
    • http://ibb-online.ru/f/file/bakokomapedivagefi.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2ce81d7d9---83089286618.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949c19b93fa---42513983792.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/4cc422ce35b5e27742826643313ef728/josewivufu.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/23566764316.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3c09d35f1---saralebibutikorajudiluto.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/47715714715.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021052905303776.pdfIn PDF document text
    • http://fdceta02.fr/catalogue_dynamique/file/91099977914.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/fafojewopugedije.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096b766454c7---98569148298.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/909e1deb71604c7343d5fb4097124661/11306282730.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160beb586c0e6f---nepota.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160715784030e1---29309999423.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/sejagorubazufove.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/17653915232.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edcabc6f0b6---kipajilovuti.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b1eafca13c5---dipulananokaj.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/pores.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/tufafim.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/gidafekenogogisu.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_off0000cd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD79 16324 bytes
SHA-256: b6530b5090095ddb4c05d98aed0d7507a78409359ebcb03b7d0dff48e31ddc76
font_01_sfnt_off0000f790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF790 10608 bytes
SHA-256: 5f83d4ed4188f842500d50e1fdc03ab266dd9b851399afdfa507154c7244a14c
font_02_sfnt_off00010fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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