Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b4c1f5af1ebbc5…

MALICIOUS

PDF

92.2 KB Created: 2021-09-10 12:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e72abb9854a79c20edd0093dba7db836 SHA-1: c939c30ab7ef3ffae35efa865db2915ef46f14a6 SHA-256: 82b4c1f5af1ebbc5dac55aa7f4c9a3818d49f2e9ad369a22e42ce2f0b010f63e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised CMS upload locations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://huntic.ru/uplcv?utm_term=the+human+tradition+in+california+pdf PDF link annotation
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16132e60db97be---50524145946.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bodetukatum.pdfIn PDF document text
    • http://htygroup.com/upload/files/vumosu.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/zujakexepajezejax.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/80318389085.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/zorapuxedepu.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/41635548911.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/kimomuxuramamoko.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a9d0587fd---99583035869.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/87487400524.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d5815c9ac---26044167226.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/5999375374.pdfIn PDF document text
    • https://migger.dk/userimages/file/3227319558.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/tuzata.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/zasupetuforixufetiga.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/78015556397.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/jatejanazuruvoja.pdfIn PDF document text
    • http://travellerisland.com/files/95666085468.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210901065251.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/2049402857.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/f5f8901f480f19679036ab772508d188/tezafuvagazowibasum.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f503f8c2da---89424262671.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/tubewavabelikalelupefo.pdfIn PDF document text
    • http://langmypham.com/luutru/files/88900865783.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_off00010249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A60 10780 bytes
SHA-256: 36d28c25fa126b72c386ebed064a54312201aa956b81b9cec2279b51e2f279c1
font_02_sfnt_off000132eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EB 18332 bytes
SHA-256: f9b6cd5c69e2fd18fe39214b43884c684db65e4a290b6e2d2366e17c82f1063b

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