Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9ac4dd8c8873e6…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 02:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 69aba6f967f4a3b978690436e55c4747 SHA-1: e026f2cb222da96fced827325cc7392f8d3acf52 SHA-256: aa9ac4dd8c8873e677dd870dd4722de718d3c7f093079d0a963025926a12a607
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on disposable domains, a common tactic for phishing and malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a method used to bypass gateway security. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://akwarella.pl/user_uploads/file/58469794505.pdf In PDF document text
    • https://digireg.at/upload/gaverunegenitadoxepa.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/31057628879.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/makini.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-2/20210902055004809974.pdfIn PDF document text
    • https://sanmuabandoanhnghiep.org/images/content/files/fetijizupixejofebupikiti.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/6025feeqt4p24s4stb14q0hop5/wotepobatatomuba.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/ruxutevasexiv.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/82197175015.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/nalelikivom.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vuvatawivumokobeni.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/e9d89cb43eb2de03c2f29ff6fb8d0e34/fokufofopajexojunevej.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/22364151017.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/texoxe.pdfIn PDF document text
    • http://teakdeck.pl/files/file/fefofubuwekusabugotu.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/vigodajidukimagujitezamem.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/52683810224.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/18260689443.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/gurubalewet.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/sotapizupaxoxigarej.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/0190cacb8cd2ed97b1a520d5126f437a/jasatalelafonamuse.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/jagogefowuxasoxafixow.pdfIn PDF document text
    • https://ysh.my/userfiles/file/94806270431.pdfIn PDF document text
    • http://thevalleytrader.com/files/xulilekutubetevizuva.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/29723009160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=wifi+password+finder+for+androidPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/43993270530.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_off0000e3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCE 10428 bytes
SHA-256: 69761f6f3e7db47ab2a6134b6eb60eae2e7b3e560c2c70760b67fed6383b239c
font_02_sfnt_off0001138f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138F 16920 bytes
SHA-256: 352bc0578a41d7b4d1d2477b3326e80b87d97e048f748c0749604d2455b19bfc

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