Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b8de772edc6c6b…

MALICIOUS

PDF

109.2 KB Created: 2021-09-03 16:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 263b92747acdb1d432d0e97cb8eab0df SHA-1: 9ee8e202dd6774793fed5f32909e2ddd7bee9b2e SHA-256: c1b8de772edc6c6bca7aab42c1860c78104fab41a09ada585f4abae8fd53672e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, indicating an attempt to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for redirecting the user to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8e785188b1---94038602071.pdf In PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/05etvkbskvakb9o6s9q9552dkl/berenawejoga.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/movenowizo.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/rudarirozexegedusamajepib.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb65406f26---68643341964.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/31998867595.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161063457f3afc---60423953833.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4175065bf---nisilanovogumanowifojev.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/15233054953.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/55779148399.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/1913a6a4037d083194dec921140b4086/26601538223.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/f2c5b91eaf4640606318eb8866e1dfee/99527282588.pdfIn PDF document text
    • https://subarini.ro/mm/file/govezijiganukazip.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/sidomesuvejumevuxuxinib.pdfIn PDF document text
    • https://etimes.mn/uploads/files/34128416185.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/94438954553.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27927a04c0---doxezadanomafa.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/a28941e396b30d17b59dcdd5afb8a1cf/warogaliniw.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a073e8e9f86---bevafabizitewufaja.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/damikob.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/79632952509.pdfIn PDF document text
    • http://redhillplantation.com/clients/1/1a/1a02e1fabf1298af97853074613e4b20/File/bawefisixexetoved.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/aa29eb222f88c33c9e7d4f1f981229c2/rodirufaliwamitesiwubozop.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/boxirominuleroxiw.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/18bht2fr9u4n2t6aj9u3ig3pm6/modekumamukakujufiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=astell%26kern+ak70+manualPDF 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_off00014915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14915 9500 bytes
SHA-256: 193ff00c1a75f87aacf1500e702c846c7a770222bd045f5119fb69f6ffc3efe0
font_01_sfnt_off00015da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000175b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175B5 19440 bytes
SHA-256: e82a4b027dc04160f44b4b366355c1b9247526ba18d6ce0a716c41bda7cad1e7