Malicious PDF — malware analysis report

Static analysis result for SHA-256 64362fc1f7a0b6a8…

MALICIOUS

PDF

83.6 KB Created: 2021-08-24 14:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2b629d8acfe38ea2fc3d96ffb8c7b730 SHA-1: 18f9d6311bf467cd8135b5d19553a15a1ebfc604 SHA-256: 64362fc1f7a0b6a8b0314b4b04b0ee3c0dab97aa7d6b07afcb0bc674a16de735
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 numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a phishing or malicious redirection scheme. The primary function appears to be directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://playerpress.com/ckfinder/userfiles/files/28255228343.pdf In PDF document text
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/44263563690.pdfIn PDF document text
    • http://jar-ted.pl/file/78476947187.pdfIn PDF document text
    • http://www.heksan.com.pl/file/92935896959.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/wubotemadixavosewe.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/guros.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f053238ead---desotarevebijifezamikana.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/tunotutubozovumujokaguba.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/85362770467.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/mogabowur.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/fuxijafaju.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fa4144641---fasonemaneriwod.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/70468166502.pdfIn PDF document text
    • http://linker-apps.com/files/63066737398.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/noluxat.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/6238413118.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/e409c6108c48455b272fe2006a52abb4/gejakanubewus.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/0eef4fd0a646e48455fa084fcaee55b1/dapomujas.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090b285477f9---zekupokeded.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609278a2c7171---zeferofada.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/29182899332.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/lavetugivepemexiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=jump+start+car+which+lead+firstPDF 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_off0000e2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CD 17032 bytes
SHA-256: d634c070c45b33f00700f78cc8d06ba34e1da2b4ef53edde67ebb4524901e8b9
font_01_sfnt_off00010f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6E 10840 bytes
SHA-256: 6f917337870cb75a4436402fae55cdf243f05188823f27b16f2dd4e1db42f0f7
font_02_sfnt_off00012889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12889 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1