Malicious PDF — malware analysis report

Static analysis result for SHA-256 4656f5a88a4156ef…

MALICIOUS

PDF

78.9 KB Created: 2021-09-18 16:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b13e38380b37b38c55ee89ad0c0e761e SHA-1: ce5989f1d4d3a519f80423fb365670c7a429c284 SHA-256: 4656f5a88a4156ef828703fc61f3ab9c48bffb11a9894b19b6e0ea57125a4e9a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=ipesa+loan+app+download+apk+download+free+download PDF link annotation
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613058f0379d9---fokajor.pdfIn PDF document text
    • http://dakov.hu/_user/file/riperofidinixe.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/potavemowala.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/15300301620.pdfIn PDF document text
    • http://lagrupacio.cat/file/9907695209.pdfIn PDF document text
    • http://josquin-capella.de/download/mexoragafofadivufomus.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/ktr0mt2u1tlghrm55hvahif91v/gobutiwadarujosij.pdfIn PDF document text
    • https://cakkue.com/contents/files/41712405232.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/moxeba.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614323c507c05---gezikibifajudewimili.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/87803297943.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/33461373981.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/berosarawave.pdfIn PDF document text
    • https://rtaadmin.mrv-educationservices.com/content_file/files/niloke.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/14318813964.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/99725889937.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/59480506234.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/pazolezabulonut.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/41250271816.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/41235129240.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/takase.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/wumipufikodeloginomumita.pdfIn PDF document text
    • http://khacvietlaser.vn/public/images_news/files/zimotaxepusiwudakuninutof.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/20669467103.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD211 10428 bytes
SHA-256: 3f0e438c5d15fcf15e118038e3a4a156075711bb6d45538931596a408fbc1268
font_01_sfnt_off0000e9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E3 17084 bytes
SHA-256: 2aabe0bca0611ad5e3fd13ee51ad7c51b39d764721a0b14466e819d27843bc5c
font_02_sfnt_off000115b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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