Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0f22fe93c82fd09…

MALICIOUS

PDF

78.3 KB Created: 2021-06-29 18:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7676c2598ed78c3a261d88e1818d8d24 SHA-1: 10d28849a58a87b450ad2175c03bed9f87f6fe6b SHA-256: d0f22fe93c82fd0913a1e3a0fd4152ddb4645e986a846c01069192e1f6545e0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16087d4c669350---mewojaduwejibikifojo.pdf In PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c77fab49d---69766227605.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/3713285516.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/um9p4lcggak8chdf0h8f8613i4/49383015344.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/mitagivixufowazetimurawe.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e108cbbf59c303a31e2ff665029836e5/pawipifimuwonubopuwovoru.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d3f1a2110---90601674892.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/jskm3db5242n13624k5ealu3t2/24279180962.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfda7f6c708---getofulitapek.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901fc9d78ea---robuka.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2599111603---jufubax.pdfIn PDF document text
    • https://papiratisk.cz/soubory/68690736102.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16093d0405157d---19338390237.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/3fdf197cb06fe03b7c3e6ba88ce0af92/zixusoretadebaxizonemoz.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/65e2gojjmoe5mkgi736d1djdq2/53835813576.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/97248656977.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/c5d5ff1275fb4fc91e9b22901ccd7025/pabosapezebafatatoxim.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/bd57a1e2a83d6a174f684a97451a132f/15426591138.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/jevipom.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/tutolaranunemimuwusol.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d31e77648---16447290532.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d46bbf0d4---damaromelopogokasowilafig.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/476476477252db94f8cd39ed07778221/16333595657.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/83757836360.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=guilford+county+tax+department+phone+numberPDF 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_off0000cefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE714 11212 bytes
SHA-256: 2271813765aaad2c9e7d513fe3c12999aeb3e2779852671e27baebdd23782eee
font_02_sfnt_off000100e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E4 16452 bytes
SHA-256: acc5f1638cdb41213c890e92fa045722b98e98616f9a27ea75bf1b0c5ad83403

Open this report in the interactive analyzer, or submit your own file for analysis.