Malicious PDF — malware analysis report

Static analysis result for SHA-256 487dfb4f67eda312…

MALICIOUS

PDF

75.7 KB Created: 2021-07-03 04:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: adc4b97db8a81875836ae4e5e9a16f89 SHA-1: 27d0010941489015833ff11e0f562fde4b10ad4f SHA-256: 487dfb4f67eda31202e3321c31e90dc2f0158fdffd62d77bf6c878c17dd2768d
156 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. It contains numerous URLs structured as a link farm, many pointing to compromised WordPress sites, suggesting an attempt to direct users to potentially harmful content. The presence of external URIs and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://catamma.ru/uplcv?utm_term=the+suite+life+of+zack+and+cody+foiled+again PDF link annotation
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79680dbf13---56710246305.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608598cf6d476---78785631060.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/pokunov.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/e68ejd5rvq0kegll8jsrcnav86/wigere.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/xapurolokasovol.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/31173493842.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/c4mkfbgrr6c4h8c8lhb5v4t9l5/39361914515.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/80808728668.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/sjvrcbab7e7d8oc94dkrjcts06/86968359651.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/323857960.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/mujojorega.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/mififo.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/50108000453.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/33377166824.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765e468e324---xumalerujezuruzikudema.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/gukaf.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608121f4dff54---nekeronu.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/55972562880.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/15318114983.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/qvc8r4jguak3cmfccsui23bolr/67139583786.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/rodozijaw.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f686ed76e2---tufarubefanojexalivig.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160adc7bc67dbd---8589704194.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_off0000c282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC282 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA99 10984 bytes
SHA-256: 8d39eb39ab7d401ea9617ba6b58e5fedcf63263f02bdc03984cf64ab48984b4c
font_02_sfnt_off0000f3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EC 17828 bytes
SHA-256: e07181a3a30ca5fb63735fff3638aaeb9ace2dd454fc87980ee0eb7a4a361786