Malicious PDF — malware analysis report

Static analysis result for SHA-256 9414e88976ed72e2…

MALICIOUS

PDF

91.3 KB Created: 2021-07-07 23:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: e973efc078fe50c061d0946938b644dd SHA-1: 8e8c09d2dce22ae3cac24ca429fd71384e2b0883 SHA-256: 9414e88976ed72e2660d6b5776fa1deb24d1d859490bfdf896ec1c23bbfad966
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 https://exporoaster.com/app/webroot/files/images/pages/files/pibixekiliguxuxafijuwoges.pdf In PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609220068ef5c---87161828971.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb7d4dda1c---bofata.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/pofolipa.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/8864333951.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e0c0e4c3---tuxejopegojodojo.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607db89352efe---ditot.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/3f8658b9ff4399881651d9a420d7e6e2/nusajumepavinixutazi.pdfIn PDF document text
    • https://mattress-leader.com/media/potarobejarurupi.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/somijasiravatofise.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/49318839348.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608984ccb1085---bipinen.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/e62d5eb7e3dfb883a264b46acdf6d8ad/21340663978.pdfIn PDF document text
    • http://poorclarescork.ie/images/26946413136.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/36654656828.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/29472319018.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081c3743d481---28059850475.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/lulorutezejazorunukimatur.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/004d056c26c0edc738d742b9a1d2729c/92591918266.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a77afd3ce7---30560015988.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/40165081302.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/wisetobobidowekerulawox.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5197d508bd---fowepukirosuj.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/023ddb60c745c035e13b29318dd21b22/posimonodeziwapini.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/gesitepuboteses.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af63dc63e76---wugufixozatofaxugegu.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/719c846867435caed30e3d52c72c5f5a/visod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=by+any+means+necessary+malcolm+x+pdfPDF 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_off000101d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D4 17100 bytes
SHA-256: 09e30c48b384d91cf72163363199ba87854ed53b06ece32a0945c29affecad53
font_01_sfnt_off00012e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E53 10860 bytes
SHA-256: 78c541aa875fb8f5c5d0925c39f52ca8ff1c66156c20d22dbd878cd715b14699
font_02_sfnt_off0001476d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1476D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1