Malicious PDF — malware analysis report

Static analysis result for SHA-256 dabf682e709b61b2…

MALICIOUS

PDF

78.4 KB Created: 2021-10-07 00:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 598845b9902d9ee8b00d543536fd0df2 SHA-1: 1574be559bbc3b23f8dc86aecc23161ce048dca3 SHA-256: dabf682e709b61b2c4b51729c6d9c38206dc12228d43efd0bfd196e14d5921c1
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

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://eqletstalk.com/uploads/files/202109302232439752.pdf In PDF document text
    • http://milwaukee.center/userfiles/file/kobit.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/88287969896.pdfIn PDF document text
    • https://virker-ikke.dk/files/78696088764.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210923_033132.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/bomuvaloguzagir.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/zizulozavoginuzak.pdfIn PDF document text
    • https://wonkingchina.com/d/files/xatibemiferubuja.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/watoditarenamovexetivawo.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/77470221644.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/34250789531.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/turipugesikamalumowum.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/42763132099.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/zuvez.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/pegevezamimukefeme.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16153f1b3451a1---rinejizixukipefe.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/17222863648.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/51955801855.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/munonitabimuzi.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/94165231303.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///nebidukime.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/jutusawofulu.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ccbbd30f2---41078731882.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/44865177408.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/03a28a91e47bfaaaf56fe1745ea01ad2/44521634426.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/81274651027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+tame+flying+dino+arkPDF 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_off0000ce35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE35 17256 bytes
SHA-256: 076a5fb72f1dca62f74723ecfe6d203d537753041453e682dc0d00a24ba26317
font_01_sfnt_off0000faeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEB 10812 bytes
SHA-256: 262be4b3dc25fb2ec554c85fd8ddb4caeb53b4c5671ed3653e8a6329452f4ecc
font_02_sfnt_off000113a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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