Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d5d4dc1801cda0…

MALICIOUS

PDF

85.1 KB Created: 2021-09-05 14:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8acdfee50a3b692cdd3ea18848183ca6 SHA-1: 601068d2e71590ea8ed6c74112b5a3a617317b3a SHA-256: 87d5d4dc1801cda0ee273a21ecf69d12629dad900eeb2fa0ff85be090fb6f9ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://garglob.ru/uplcv?utm_term=gerudo+valley+tab+pdf PDF link annotation
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611739650695a---65089131432.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/jativejumamep.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f3c94cd30114fc8cff1b60b447566389/14880448335.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/purefe.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/56263599121.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608226d5db113---mololipuxobuwipetetiguban.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/fowolexolizedosa.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/4phoqia6j03lt5fkbf0o2fa665/muzaludigaxevojut.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/2271450986.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/5861dbd5b31e03c96556e4ade2516402/55621671609.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/xoginuxitibosuno.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210718_99526803C5EC2FD2.pdfIn PDF document text
    • http://proart.by/media/file/nuvebura.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/44796772396.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/dekiwor.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/92627452885.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bd4e93bdc---jubusipupataburegirujoma.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115b4b2728fe---dejupatazuxezelogafefazok.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607eabff053b6---60095030159.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210817052802.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/64450056580.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/rugekokivozalur.pdfIn PDF document text
    • http://www.asslar.de/downloads/mevuriwo.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_off0000e8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F4 17592 bytes
SHA-256: e8880ba4ac234e60120d3a7fe05ea5b84479cf2ae2569ac2e52f141ce98d7d86
font_01_sfnt_off000116ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE1 10588 bytes
SHA-256: 84bda21450db8c040848a9b1d706a2eae50a1c077fa25d80313bfbf002f04724

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