Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec98b9c98fa6f01…

MALICIOUS

PDF

88.3 KB Created: 2021-07-02 19:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 44b8de058a201a0b9415c0dc6eceeb47 SHA-1: 6ed4853d84fc29f9e0ca6188f38f702a3458a281 SHA-256: 8ec98b9c98fa6f018e980485c6d66c4d66733f9d423399040ee8d395ce43e865
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting multiple URLs that likely lead to phishing pages or malware downloads. The presence of compromised CMS upload links further supports its role in distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5c708098ab714e615aeb4e43a77c68e7/veboxitokafijejasumet.pdf In PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774cd9b1a40---velazizekasaluri.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/phnva4rrro7508tc9ig1em7lq1/xakekirikametokudutipora.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/t1ipvnrmojdqspqttf38ip4vsn/zepakoga.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dba1c43fd---96794348883.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/3460093471.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/0a34db68215dca4c2a62d4bf2105594b/68763396952.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/3b2faa5f015a4e5f47fe6a8b0c2a730d/21684062613.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/46b04dca3e88cf818924bc4f2f988eec/dijinekibozu.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/roruxuxirilexamabonirerug.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a427b183dcf---21151623793.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16095d74ded4d9---87963274065.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/14de2f6408a206cf601356c53e19caf3/mowug.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/5ia43pdk6reo76letrik1rd044/70339036552.pdfIn PDF document text
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/48814755577.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/64533783360.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/q7mcabb6k1glhouigg3sqk6920/bidupuj.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/81819196292.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160967b1c04402---91854891194.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160aea50122acc---29347701600.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c8f082ddb---83848361427.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/sebugavotewu.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/f39e9bd5826b548633afd80d4d0e8135/nukunaributi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=gradient+of+a+vertical+linePDF 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_off0000f5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BA 17548 bytes
SHA-256: c44184e798c029299c8f588ef7f55ed9fa4d4c35e87b0b97571ac4713543c3bb
font_01_sfnt_off00012420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12420 10404 bytes
SHA-256: 3c4ed1ba22668d2e3b59e7c4e484d56fb67511c6ea68c1bf44c64b22a95fbbc2
font_02_sfnt_off00013bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1