Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ca104f95016022…

MALICIOUS

PDF

88.8 KB Created: 2021-06-28 15:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2b393997f832a0bfa9b246d210c5c0e3 SHA-1: 65330f0a3aa090665c0692cd284bf7a1539ff481 SHA-256: c7ca104f950160226dc9a577b46e72312af8f2370dceb1af9d29bc63defba1e9
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating an attempt to obscure the final destination and evade detection. The primary purpose appears to be redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://zhengfutz.com/v15/Upload/file/20216121512477130.pdf In PDF document text
    • http://aeronautike.com/userfiles/file/tuxetidanogelalanugaja.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/gafefedesaji.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073fcbf71aaf---47030522458.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160763fe5ab6e7---69399264714.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/8596f51621f6636a3bebdbaf68fdd559/zewaseralitorisagegoritid.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bde72f5815f---96553782186.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/jirilupamu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b98889637a5---junedatid.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/xokosixamiburepinuxiwulen.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beeff0b6f1c---muronororobakarime.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/kakuginilofegumip.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/49793769850.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///68941690965.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/094e986931d232a1dc5d22f917976e7b/xuzugebege.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad513d6bd18---59764083793.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/4c4ab2b47eb8fe59d050a1d8d2abffca/76874950261.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ujje01m0nrg0bbnrhgktisg4bm/60019347263.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/zumogavogederawejesixaxi.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160841da61e9b2---riwunegipi.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/mjlevjgkrnq4pvee6evgh8tngd/netabepuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=isomerism+and+its+typesPDF 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_off0000f736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF736 17992 bytes
SHA-256: b5e1a4d1f28b2c9c5a57871af1fbbe2aa6a5dce0764b9ff67616f13a65dba73d
font_01_sfnt_off00012638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12638 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4F 10572 bytes
SHA-256: 7b3ab48da42a09a3e285a35de80a83eb369454128d79ef0f8c66bc88dd1518aa

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