Malicious PDF — malware analysis report

Static analysis result for SHA-256 3700da8dacb854bb…

MALICIOUS

PDF

91.8 KB Created: 2021-06-29 13:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6177a887168e1393ecaadece2f1fa2c3 SHA-1: d1b556a33060ddad398e26e0aec88032ed8b23a4 SHA-256: 3700da8dacb854bb5b7ae53a951255e9ef9791939d5f427c3ba17e23829f4b7c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The embedded URLs suggest an attempt to manipulate search engine results or lead users to phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f27e00d395---14387487807.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16075c1ed70610---70679309405.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160746e4fcf732---8911262127.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609733c2aa3e7---lijeze.pdf
    • https://path.mn/userfiles/files/6864105562.pdf
    • https://ccskin.com/geektic/files/3413108223.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b767e091c7c---88843442143.pdf
    • http://akcjonariusz.com/UserFiles/file/munozunolajugiru.pdf
    • https://abeess.com/userfiles/file/2403878940.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097017eb07da---15580684604.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/8ce1e837b384dad398c3c864ca84758e/riwoxinazevuzabopeb.pdf
    • http://sahamit.net/userfiles/file/10268787293.pdf
    • http://sakaryakasaplarodasi.org/userfiles/file/46772878997.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/62ii3hhq8a1sbacc71tbrhpc16/luvawazodosalatuvejetu.pdf
    • https://equinox-e.com/upload/files/24083527599.pdf
    • https://promise-land.com/upload/file/mefegojigawewaxenudenupal.pdf
    • https://ratco-hardware.com/Ups/files/woguzikabuk.pdf
    • http://samafb.org/uploadfilefiles/32330144568.pdf
    • http://aggengr.com/uploads/CMS/file/makonipemarakum.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=most+popular+hip+hop+artists+of+all+time
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/eccd3ca486806c9b766d019d854867ba/ravakolep.pdf
    • 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_off000102a6.bin
8a294bf9fadddc237ef4aa242da804d569dafb9a29a3b90f65c559b8ebe8b608
pdf-font-stream PDF embedded font (sfnt) at offset 0x102A6 10612 bytes
font_01_sfnt_off00011af3.bin
baef022008608748476362aa95feb5d280032f6909311abe464101abe329d74a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF3 17848 bytes
font_02_sfnt_off00014a2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A2D 16792 bytes