Malicious PDF — malware analysis report

Static analysis result for SHA-256 c260c3eea786265f…

MALICIOUS

PDF

80.8 KB Created: 2021-09-21 10:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 873bd5d701b8698bee0766380c8e4d5d SHA-1: 21dc0bb1436f868f0b1bc3ec5c1d01f10e97c263 SHA-256: c260c3eea786265f755d63448798e89f0c226dac907843991c75b104b329dc1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to domains flagged as potentially compromised or disposable, suggesting a link farm or SEO poisoning attack. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

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 http://goodlack.cz/userfiles/file/40311800985.pdf In PDF document text
    • http://thegioioto.store/upload/files/33373365949.pdfIn PDF document text
    • https://actorconseil.com/files/file/38933543290.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/guduru.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/70048053176.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/2e03b03dca4f6cd20889f1bb2e3b9241/32120659288.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/32406866035.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/mozupiwesivufilolegi.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/66234818536.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/wujiv.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/cee6943dfe786fbdd56e8dfceeaaa0a0/98891045156.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/podavupoliwire.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/17567070380.pdfIn PDF document text
    • http://flirdining.com/uploads/files/43013104840.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/20303db8537f87d2f061cd3c856475de/positigek.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/bapowezepif.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/repinosulanebatagidukop.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/75392077556.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210920155141_8hha95.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342f051dc44---96563935580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=high+speed+networks+and+internet+by+william+stallingsPDF 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_off0000d812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD812 16708 bytes
SHA-256: 2c6fa60056bf9bf29ec66b16905f38da3cbe599a01a7e7882c1d3c78b0998785
font_01_sfnt_off00010357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6E 11260 bytes
SHA-256: 01f4af69303d1480c2bc9b9cdd5525785c6fdae26abcbd3d9cd306f07ae03957