Malicious PDF — malware analysis report

Static analysis result for SHA-256 156b182762755a11…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 10:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1c4da0cbbc1f5ab326044f30b65f231b SHA-1: 5d45492f10d2a8c30ac36d792ca662bcc52ae807 SHA-256: 156b182762755a114d9a6a98d4232106dbbe31417cfb96b92ea170f4d446b5b5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.buildingmalawi.com/images/uploaded/documents/83821556348.pdf In PDF document text
    • http://gesgo.de/userfiles/file/39645465140.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/edh44janatvgk790im9h4s9s90/38734026700.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/74940980355.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/tufinoturebabil.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-8-12/20210812175619533231.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/boxukozavovamiw.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210719054543.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5a1f6429f---29835012960.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/5410272439.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/3c73355ed79883017b6227b9701d120a/zoxapajelifobuwetub.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c85db0516fe---42386865424.pdfIn PDF document text
    • http://rcot.by/pics/files/rojak.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/14c7dce1845b3f58699c3fa9a84a6d72/namuwowokugiduvajavudi.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/8988937811.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/waridoga.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff33482bec---56558471655.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/22905362695.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/89854020281.pdfIn PDF document text
    • http://apicn.net/upload/files/67347110889.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/subixopitikakawibodugadis.pdfIn PDF document text
    • http://chromoink.com/updates/file/65076096994.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/e025f71039a3167fb69f0ae01e17642b/87564229395.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/72555886634.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/8747383266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cambridge+english+phrasal+verbs+in+use+intermediate+pdfPDF 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_off0000ce1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1F 11164 bytes
SHA-256: 195c2bf89fbff2b3f6d1cd0cc44f70e8d8864d35f8efbef688a89156c837f2dd
font_01_sfnt_off0000e793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA5 21052 bytes
SHA-256: 4b41715dfbe71d41b74f07e700914b77aaf935059b7f9a180e11ddeb14bd0759