Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e1cf8e1647996c…

MALICIOUS

PDF

82.7 KB Created: 2021-09-09 10:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7f4f8376a62a9f0a0a41fc0eaa5dd7ea SHA-1: f6d33f844489da911bc33d65c5c21c993a4f360c SHA-256: 42e1cf8e1647996ce7fda0431039800af5cc715ec7313db7ef18f0e9475bd5da
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDFs hosted on compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download' button lure further supports the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/83eb0dabd4629fc067deb5b6bba7d179/26011834629.pdf In PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16134e713ed4e3---vokidugonibu.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/jidodi.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/99074519053.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/wugogo.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161344f1da68b9---90561836072.pdfIn PDF document text
    • http://strandedtattoo.com/file/77222637887.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136030e19b35---widebobi.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/20437938686.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/76254340088.pdfIn PDF document text
    • http://njchemland.com/upload/files/23240846457.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/18198033622.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/55357213256.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/48125190109.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/rejaxurafu.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/22405647054.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/mp1k5n0dhveovp96q1d8beq06g/91652884886.pdfIn PDF document text
    • http://webs123.com/userfiles/file/vonowapomogasav.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/43811064013.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/94053235747.pdfIn PDF document text
    • http://djpress.pl/Image/files/15219401808.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/xeloninaxiluwakikiza.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/dovujadetirudujufolid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=9+malayalam+movie+download+torrentz2PDF 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_off0000dabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D0 18860 bytes
SHA-256: 17f5394f09488c2390af19beae3dc68afd2bb963c36283f7cb6dc2f5575be898
font_02_sfnt_off0001244e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244E 10760 bytes
SHA-256: 37a2f3a37d9906ddcaab387ef75a779b0f6bbb079dbe4e04567c279fcb160fa1