Malicious PDF — malware analysis report

Static analysis result for SHA-256 dafe3cd2c4ce780c…

MALICIOUS

PDF

82.9 KB Created: 2021-07-09 21:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: cd7e680e26dab3382e6820ba382d1a94 SHA-1: 6083077d8915beaae7311749841db34e78ed86ca SHA-256: dafe3cd2c4ce780c1c896653ae4323eed41f3db9ed16100562875e763d819659
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being a link farm hosted on compromised WordPress sites, with numerous URLs leading to potentially malicious content. The document body is unreadable, but the presence of these links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c605e2de4---51500006589.pdf In PDF document text
    • https://dnmpaint.com/sdcc/images/file/finonagu.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/96cc6479a4583ada64632c9c7f74818b/vunixudexatoxixorax.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b313f216ada---sidobusuvuxidamepewob.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/33533561555.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/69a777eae35dd76fd7d84ad0275bd7ea/sanuranevoratozezufise.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7456f2cfce---71103782633.pdfIn PDF document text
    • http://artospace.com/pics/file/wedad.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e5acabb4a---81142133816.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/lbl0pdts6ugo1oouj4npsfpl9a/53243610792.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/xerijosa.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/jimovejeret.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/m3esovp7nn55lanq76ftqt87k1/40177455890.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608098a948f9f---tetikezewibidez.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/losadet.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/207ecf14ba0750a926d23f206955bbf2/64813801664.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/1da9c4591ed76a53c74aa2b7a136e2fa/55811767927.pdfIn PDF document text
    • https://airbays.com/userfiles/file/vedowobenimepexusez.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/dobop.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/xerewetuk.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/56168461926.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/ib7jp8ca5vg5h1444el8vb67ql/livetesup.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160addc5a0e999---bifekafuvuz.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/3d3272f51bf6d428cb1545c4bc294641/90014118578.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/b6cc2fdd34c8c4af518b030395e705f3/nanemufemopifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=division+4+digit+by+2+digitPDF 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_off0000e16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16D 17256 bytes
SHA-256: 0d61d568bc58831a05d5940e62e872a20844e5b04de87ef95b077b0732472157
font_01_sfnt_off00010e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001268c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268C 10500 bytes
SHA-256: 01c6064402f39d4582c810527b1f38c2a894853c49477b1df4640bfd810c176a