Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8ab022c419a434…

MALICIOUS

PDF

94.6 KB Created: 2021-07-09 14:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2d0f9523e004b0e3d283f7d26b58bf58 SHA-1: 5ab334feeda51ba10e801f6d49cfd5e7769fda6e SHA-256: 8b8ab022c419a434b31502ac6e19ff3d06109218992993d72e98aaf48faf4bd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by multiple heuristics and ML classifiers, including ClamAV. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the links indicate an attempt to lead users to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://allytemp.ru/uplcv?utm_term=pharmaceutical+market+research+pdf PDF link annotation
    • http://seyrimerdin.com/userfiles/file/zovokil.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c892f67c332---jamuxo.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ec8fa0a147c8445e9491ff4265f7619b/4830993983.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/valovaligajotivi.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/dokirusulov.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/juxolodajexudag.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bce869e6f0d---zavuzex.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b58e9a8c045---boveminetuvivere.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/d55ms0dbtk82sei79q25jc0f34/kepuwofetawimidenotif.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/37665236148.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/18b2700d00f62de2cfd228c1eb51773a/52039094705.pdfIn PDF document text
    • http://primaneighbors.com/userimages/79518977266.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/77284119222.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd528c48a3d---rokonurawolazobalukafik.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/o5htgcce3jcdjqahurbl3gjh33/10717717754.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/xamonaxiwiworamara.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/jepupazijowujaw.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bee55cb4c41---pinutojugalufepegiremek.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/a955e9a3abb9ce5006fadd4e196e8da3/nerutivefogapixebifuf.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/53056443061.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/d6a323c103139cfb0bb10bcc53258727/limaseruwike.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/jowuvibona.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/gumowawojemazanep.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/f42ae67b6b34df53eb0e43556b576753/pojov.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B7 10856 bytes
SHA-256: 35b5a64b9d8dfb8adc2b62d0a7bdd1ee5f2d75ebc42a629803630b8a17fe01ab
font_01_sfnt_off00011fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC7 20400 bytes
SHA-256: f8155efc8ed8d8165b6463c3e51f85c7f9af601001a580065614ba236ccfae8c
font_02_sfnt_off00015537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15537 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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