Malicious PDF — malware analysis report

Static analysis result for SHA-256 538bcccbbdfaebbd…

MALICIOUS

PDF

84.9 KB Created: 2021-06-25 15:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf6cf41b85c2667ed58a6a77406a0860 SHA-1: 18e25088e31f11b3ea45151b89c6ba114c921d34 SHA-256: 538bcccbbdfaebbdfa2e42b45eb03b579f1e8b73bed8a2a16d8c0e01d5274744
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pirkitpadangas.lt/ckfinder/userfiles/files/32726861528.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608309874f2e2---18742476541.pdf
    • http://analogsys.com/uploaded/file/1069946730608944b015fb1.pdf
    • https://szabobuszberles.hu/files/files/bumisuta.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/lgk5j4j3hg2uev1gtuki1vr6kb/40323860846.pdf
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/jikativoxijowirixed.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f55585ba19---19415916621.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b2bcde433---72508747750.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4cc622284---pijab.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16084cb5d8a893---bokivolotoduwemaxepuj.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a72bd4e4b---10649877904.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/9926bda356fc97780ac7234e617ad7c4/83168584621.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/0ba54e9a7a819ee061c0d2aa69cb53ba/doxarelafefipakomafakidi.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/0cdd110afab249aa6f021151c211545f/rewoxunogemukipagefedafi.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9d3ca466a---53852795642.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/0b24e3946e2013e79a48938dd6bc387b/narajir.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46654ba4b5---doxiratelu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=little+richard+movie+streaming
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e96c.bin
388fb70cc9147086bc4b0a8861c04156c46f46022751f48479a1234cbb5af518
pdf-font-stream PDF embedded font (sfnt) at offset 0xE96C 17112 bytes
font_01_sfnt_off00011610.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11610 16792 bytes
font_02_sfnt_off00012e27.bin
ee998af375e8ee6b6cad6806ce085a56dfbf48fa36fa6b998627de908fd49a85
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E27 10840 bytes