Malicious PDF — malware analysis report

Static analysis result for SHA-256 220bd7352f96d4f8…

MALICIOUS

PDF

99.9 KB Created: 2021-08-17 00:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5b0520504ee7b01e0525be8f80cfe40c SHA-1: 2e7667698181996936e638dd07226f023bd66878 SHA-256: 220bd7352f96d4f8b4f47b4d588ba5fee68efef8abf71765dbaca16e0a04a35c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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=vw+escarabajo+1600+ficha+tecnica PDF link annotation
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/fifisirijixadez.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/situsixinuv.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6512b6a5a3---44559718087.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/98562b9945e62fbd2d6524b48c210008/japasilebuz.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/uln81cqhoqtm0uveg4fv7p6fc0/57663518127.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/788ba87764417a124c8932312de84b42/fafaxepaniduwubofakijinew.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/s5cspcvjugeoi1a6o3g9oekbh3/62663958907.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/supipunulapow.pdfIn PDF document text
    • http://grandviewheightsalumni.com/clients/79364/File/dozomukusajoreza.pdfIn PDF document text
    • http://chieucoingason.vn/files/71068647029.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/b80d9dbd80e01524bd5e94d82660dc09/427047295.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/45e66304b25732be77b3e10c8097211c/katiki.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609af884993cf---zufatejogepem.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/aa7bjoegf8dlg0ksfkc7tdbtog/kepemibanimefozo.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ab58c6d8d---nuzirilazonisibabed.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160775b14ec3de---susonobexudilemade.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ogh34u747ghro2rb5c9sqbh3i4/maveg.pdfIn PDF document text
    • http://belst.by/upload/file/kamekejogofaxadivovoxi.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/82162730838.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/datufopakekadeforuwiboj.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/bufoligov.pdfIn PDF document text
    • https://seikico.net/img-tym/files/82959678327.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/5239428868.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/e212a8f4af74dd6bce3f52718fe7cfc5/61927725202.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7bc8c025c---11466045596.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4a1d3f92d---kikazuxupafudotalerax.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_off00011d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D90 11056 bytes
SHA-256: 105250c3e3ca83011f15f60c1f144874b7f93c63dc0aec15f36a917c1487c8e1
font_01_sfnt_off00013756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13756 19100 bytes
SHA-256: d14c94510720f9c45877e4db16ad5f63732155bdaa37f30695b0f5741ef956c8
font_02_sfnt_off000167d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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