Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6a9da3c2bee5230…

MALICIOUS

PDF

91.2 KB Created: 2021-06-28 21:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 191d0a0fc00e407c75a67da88a828d5c SHA-1: 9cacabc938162ef3a841022090b626bbae6b3f97 SHA-256: e6a9da3c2bee5230be2a83568fe67c5da4a477f1c73d65a33043436b8ddcab4d
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. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are benign, are part of a larger pattern of redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://learningkey.org/userfiles/jenoloxixizadaperij.pdf In PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b81adce43ff---mofepitonixobokusikis.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/feue3o0scbrs6mt2uq9ucbd995/43225358837.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/safigesetugikupejivadob.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/11e3719d818f5ef68523596bf5c8a48c/xutijowemojabuku.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/e27f12866bbc8e4624f0842fb14a238c/rezadinexipazurexituxobom.pdfIn PDF document text
    • https://citytrafik.nu/images/file/bowevesuxodij.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/a3744e112b3fc033fe595cec94770bd5/78784050589.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c83138ca4---ditusasokivojopi.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbc798d034---tugevibatusakakenagawobef.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/befex.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aee08779233---kagakepemevofanazutenevi.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606f49933335c---31416855127.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/639c322e560e9d9e171efc7cc749d7bc/zokijituzagubimotojut.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/85e6dc9f8421241e47bb0cc5550024c1/73191827513.pdfIn PDF document text
    • http://healthywithhart.com/res/file/kugolam.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160847817026f1---dogikazupibosorafu.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad014d67adc---mofuvofapowez.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/e522f5bd43a94d900ba918b42db3c589/52440934014.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/soxofan.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/35052782370.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/18636caf123f96a1266614ee879d33a8/videmitonixar.pdfIn PDF document text
    • https://dcimx.com/files/72006871408.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef1cf47d6a---26905729897.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/zuduzeseme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+long+can+baseball+games+lastPDF 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_off000100ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C3 10596 bytes
SHA-256: 1cacac5512f01af0125c03258d78945123df49ed40b2ad4fcedf5d642fe16cc8
font_02_sfnt_off00013112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13112 17588 bytes
SHA-256: 7b32776f320b4aa15ce8de2118cadab2f28e2841a70fb3dd2baf9614c0e894b3