Malicious PDF — malware analysis report

Static analysis result for SHA-256 b881bf39da578669…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 13:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2cebfbd26589e660fa8ff08af9aa268f SHA-1: 3085485276f849a59e04df5712bfb696a3b238bb SHA-256: b881bf39da578669f9a34a978ac9db62428d0933fc74998bc01cf48e70da5b75
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to websites hosted on compromised Content Management Systems (CMS) or utilize link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware distribution sites. The primary attack pattern observed is the use of malicious links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://techscreening.com/userfiles/files/49779977573.pdf In PDF document text
    • http://mea-travel.pl/userfiles/file/58781837987.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/31944181602.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/22540292983.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a621b43ab7a---mexapukonozi.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/92905587393.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/7c8d19aa9c228dbbc0f3da51b54cfa27/43106743623.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f33c09835fb---jufasugobebabifawobe.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/0s04q2hg6djrpf43h2l01i30h6/munakoripenowu.pdfIn PDF document text
    • https://energooptima.hu/upload/File/juxivigojexedopaw.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611163dba5c43---dizixawezogavovavur.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/rubow.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607eedf179b44---kagidonuganumibiviwe.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/55637464873.pdfIn PDF document text
    • http://fitviewer.biz/files/file/bufivefitadamakalomej.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ul6udd383cq6j8g1ij1kmhpbi0/27714171972.pdfIn PDF document text
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/noxaxeziwesotuluparawix.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/06d410b6215ce914b28f27253059cf30/36197585462.pdfIn PDF document text
    • http://short-story.ru/upload/file/tiwizizujixatalasemebupuf.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/205217583b311e2856d6337788a23f42/49296398986.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076bdc4243d3---45095319605.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d478801c4---54343455073.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/69335672166.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/lunerejijanesujipuki.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942bb66265c---83834124684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=chemistry+5.3+physics+and+the+quantum+mechanical+model+worksheet+answersPDF 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_off0000dd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD76 16276 bytes
SHA-256: fd32c6ada835288212fef62c15b609b84edc660c30b1bb8e93bf0b598c3f89e3
font_01_sfnt_off00010705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10705 11720 bytes
SHA-256: 5e5b9ca18d68a626e97eb885a98b27a2f8701b65477bed123a4dbdd35e858ca2
font_02_sfnt_off000122b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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