Malicious PDF — malware analysis report

Static analysis result for SHA-256 4976f4d2669501d4…

MALICIOUS

PDF

113.9 KB Created: 2021-09-05 02:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ab3235e5500d74ee7d2bb39b2c5abf5b SHA-1: fe03225551d71609c07545665004fdd0c014ccc9 SHA-256: 4976f4d2669501d4fd9a0a996c3f2ecb975c5217623f2ba551c45057c7d685a0
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or conduct SEO poisoning. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://marblobath.com/app/webroot/img/files/98361246638.pdf In PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/39394213561.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/66808840574.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/62818825560.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/29208060532.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16074db8843a68---rakubumika.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d86e3978554---nupemoxugob.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb90231bb7b---saziboleka.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160985fc686577---35312734406.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/vubikawamudagemegupoj.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16204774334029.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/kimiwewazinef.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/eda21bed95912e601bc1ccfd3663817d/35837106046.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/rkrh9aejfk0c290jmb76oqtqmr/21837646935.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/wevukarovoxo.pdfIn PDF document text
    • https://olterus.org/contents/files/92701683121.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/71875256836.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/b6pmk76j8fri7umlo1gebk6li0/69706761240.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cba7a3bb793---tinukelik.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/gagonusaf.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/10435320425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=eschmann+ses+2000+instruction+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_off00015e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E76 16368 bytes
SHA-256: 3e4218170046caf7bea4fad94f6a1cf368ac862fcc3b2190751048b6f0cde2f6
font_01_sfnt_off0001891d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1891D 10820 bytes
SHA-256: 67076edbb65dd88291715f6209f120dda53b6ff68f4c42252f910275a873e882
font_02_sfnt_off0001a1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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