Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d4221fe2852741f…

MALICIOUS

PDF

79.8 KB Created: 2021-09-07 04:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 096a6935fd62478e593c66dafa053c8e SHA-1: 143fe5516548167090f400c314becd10ed64d0e4 SHA-256: 6d4221fe2852741fc5139dbcecc192db45b3140a218fd86b5b20e7893ce51c7c
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links pointing to compromised websites, many of which are hosted on WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed to manipulate search results, likely to lure victims with deceptive content such as 'convert pdf to apk'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15359e23d0---witimubusigebe.pdf In PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7e6c514ea---86143318914.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/tawisodifejajaxutivi.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076174099301---pajojozoxonixej.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/fevazejevobibuvefofegewa.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/lizuxipom.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4908a19b8---719923232.pdfIn PDF document text
    • http://allasclub.com/campannas/file/87664530987.pdfIn PDF document text
    • http://jarosi.hu/files/file/rovamafuweroriludarifib.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/383212861.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210702_C59DB84685A2FDCB.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/32738283636.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/59575009617.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/c6c320357923f73aa23841067ea1cbeb/45634492688.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160f988d3bbcbd---zeberabilurovajuduxot.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210618062454392627dvb8crkfszrw.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/daxudenijowuna.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f99c1755f---bodibarevezonelosid.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/edad45f1b69c8def8b24f5900e11af65/28116036798.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160705a7c8b430---vomaxuniniwapir.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/jinepibifav.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210713225249592863jydl17.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/furadususalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=convert+pdf+to+apk+ebookPDF 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_off0000d086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD086 18728 bytes
SHA-256: a2ee65173cc002c6dae13e070770d0eaaa0fa379819c1281d24796220dc52e38
font_01_sfnt_off000101ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CA 10512 bytes
SHA-256: c494b30c2d385ad1260c1e014fc0d541a04a8fc1bc0007310c8fe9c5a174a091
font_02_sfnt_off000119ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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