Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d44789a283a5c4…

MALICIOUS

PDF

82.2 KB Created: 2021-07-18 15:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 64770be622a4b72d5c11c80a8970ffc1 SHA-1: 7dfb3bb16513bcada63cc6998cd2854891f71895 SHA-256: c4d44789a283a5c471120ce5b701510119570974411dfcb181bfabd944412c14
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple distinct hosts and the use of 'utm_term' parameters in URLs point towards a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://stradatextiles.com/upload/ckfinder/files/wunugexekibejitotijew.pdf In PDF document text
    • http://greenplanetnepal.com/userfiles/file/27592877052.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/76a13ef2d048acec592b88610e260282/9265014776.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/4942975a8cb8c95ea17714bf789fac2e/xuwumedobora.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/xejap.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae867e4fba4---pubabipigigo.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607808e5c914c---bofumuvaw.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f83919bc7---28030373501.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ghl5ihe4i3e5djgg1jla2u4kdb/35170763915.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/zabifunubegemogunaju.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/nunasanekekipadaf.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e19ee61943---43195959657.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/91608143391.pdfIn PDF document text
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/7123048909.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/verali.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/xivebalolamigili.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/muvozosibedo.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/1ee475c330f34e715678584a52001098/17105316880.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/nitij.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/vagawotajokuzowerexoruz.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/8d89dc21664360532a8d540b17b449f1/12540038758.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/watejobaxonumipabow.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/e765alqu755l0nla56c344ca16/89422323470.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/tawulifumojimuwidis.pdfIn PDF document text
    • https://bliznacite.com/files/vovivurigama.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/7an5s6tcj9nb1500i36bnv5bi1/metipubowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=quantum+wifi+dongle+receiver+802.11+n+driver+300mbpsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD009 1704 bytes
SHA-256: 2d59b2b1bb9a6f9bbf889029c1db5c2207fa4dbd30617e885d593f86b64e3e7b
font_01_sfnt_off0000d810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF022 17980 bytes
SHA-256: a7f2e51e11d68556c842cebe40fbf8b8253f9d8b15dfc74fcd5643a40ae94322
font_03_sfnt_off00011d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D71 12156 bytes
SHA-256: b622a5c009fe65e173e7786716ff9d22b03818a63bfdb48ddaac8ffa2c466e1d