Malicious PDF — malware analysis report

Static analysis result for SHA-256 358624a8519a75b9…

MALICIOUS

PDF

84.6 KB Created: 2021-06-30 09:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d6dfef1cef808a7744557b76aec4ea49 SHA-1: 5bfa2cb9dc6a74e0e507ef3eab988d3133024b88 SHA-256: 358624a8519a75b969de88c91c99f6bf1b86fbe0bd1e9e1384ddce1f09c6b4f8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/8adbc664c70410486f011e5d5947a2d6/jonuloxusanonaburuxojotep.pdf In PDF document text
    • http://hrdiborice.cz/erucom1/files/files/45154834616.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/betidevasugakopebesakad.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160874e7a609ef---82275595112.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/5cb759c26f445e9337e172ef95c0c171/37665167088.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • http://rallyteamwalraven.nl/file/99945316120.pdfIn PDF document text
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/64993089823.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/17826986164.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944909e8d7e---vaxupu.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/b6d0p128vcid2lert3vrhas287/70949191378.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/najelobafu.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/sajakisowobimoripadetovu.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/sabawi.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/1a4c7e1f6b4a25a9d12b36da1f6fb25a/57637263028.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/44050443448.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/zewizuzavejatixisasim.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/df8d75aebe80fb1a5f876dd94ff2cb8c/saxinewuxinisomuwirokopeg.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/4061a0afe5de164f8d971e745ee269d4/68771528658.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a4476538b---31133235894.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/972cdc26d9b03e3400bfb53da138fdb1/53001407231.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/pibele.pdfIn PDF document text
    • http://vickerycarpet.com/uploads/images//files/xaxenowipap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=mouth+of+the+mississippiPDF 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_off0000ea2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2B 16976 bytes
SHA-256: 61678a4ac39bef85452e7c7316c98dfdce712d1349d856c496e3dfdf94d4e297
font_01_sfnt_off0001163f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E56 10304 bytes
SHA-256: 1ac50ddf73e70c3494e44dddcab1f795102363e4bc6ab38f2a2e3193816394a2

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