Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3602ae3bd0d743…

MALICIOUS

PDF

80.0 KB Created: 2021-09-07 10:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8816ad5dc67d67263470d3be405afde5 SHA-1: ef1c4a7121cbee0f5dab7fd03ad1cc95da51c002 SHA-256: bf3602ae3bd0d743aa1d838c921bbf40da89b880b5f2675c4ebc7488373f8f33
156 Risk Score

Malware Insights

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

This PDF 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, directing users to multiple compromised or disposable hosting domains, likely for phishing or SEO poisoning. No scripts were extracted, but the PDF structure and URL patterns suggest it's designed to exploit user trust or search engine rankings to redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://cgpreceptor.com/ckfinder/userfiles/files/bikomajanaxakoxut.pdf In PDF document text
    • http://moneymaker-gold.de/files/litiz.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/ratugufemelabodubexa.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ef4956c197b778cbcc13a85a69828e06/vodiwobaw.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/399da9042c215453e97876dad22a7f7f/sufimame.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/59119945237.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f516f96677---bexiz.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/fupokebatimitutonuvod.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/926qqu05jhs0lquq56cmvdf3e1/8002685297.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210823211452981322.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/38daf9f9d801595714ce75e5d579b6c3/30637349172.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d54e78652---petaxuxaxawifof.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/34664695880.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2e3p02f9m7g28ldu7u453fbn6/83077907014.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/xavagizavoraxazomaguvip.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/xivubinegurunokumodimep.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610952de573e6---21312781817.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/ribeverolebojaraxagabog.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b4391306f9a---xewenavuralugupej.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/5f3c9163aefebe3cdd94ee63f18e99c1/nadokolad.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/0829c996a7c9d61fe05c7e41718f1259/sakexu.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/2567139638.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/25288460036.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b41ad5aaad7---dewozevokiji.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/47538020115.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/uad57m0j0mjbfhj2cmfvhmeqg5/9831127506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=tally+marks+worksheets+for+grade+3PDF 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_off0000d4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AB 16812 bytes
SHA-256: 26f3d0cee7a58822906df2ca9bac756c1f31d0a402914786a369c7a3e1c21e7a
font_01_sfnt_off0001007a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11891 11032 bytes
SHA-256: cf20d75c3a25d0d56905d57d2b744dae2cf0f8950a9c67a13e129c136e0e8a1f