Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad68b55c35b737a9…

MALICIOUS

PDF

99.6 KB Created: 2021-09-01 13:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 652cf122d255bac7c5330514ee125f22 SHA-1: 17a18146cc680cbe56135ee99f0970479b5a55b1 SHA-256: ad68b55c35b737a9fea7fe064a7bbb1116833df5d42edef0afb48929fc5a8240
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The critical heuristic 'SE_SECRET_RECOVERY_LURE' strongly suggests the document's purpose is to phish for recovery secrets or private keys. The presence of numerous URLs, many hosted on compromised or disposable domains, further supports a phishing or credential harvesting attack pattern, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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 http://creative-format.com/upload/editor/files/rinosubokodep.pdf In PDF document text
    • http://unewstoday.com/task/userimages/file/5076367859.pdfIn PDF document text
    • http://vitrine-prof.com/files/welatogiripilivowa.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/1c280016201899923a2c62430881dc03/ketatodekop.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/xabogaxodibo.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/dd62b6af27c695c9ccaec96b55df9acb/walujezubaw.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5917d5ba68---80026449868.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b8ec87e62---58074833016.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/rolun.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bceff65237---27315596107.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/76588904071.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/40984860662.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/33014563094.pdfIn PDF document text
    • http://fructusartis.com/i/File/73852581665.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160970a17ea857---tepobefarufizorigasusiwed.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/zesimanamoduwale.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b2687b10a4a---subawakobevudunijuxis.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/5bf7f447a1c09452c4846e0f540df212/75741578853.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc1d2243d8---mixiva.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160904ab5d994f---gesejotuvutipe.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/24541314979.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/jelilitaber.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/80682713207.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/sijum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=decrypt+message+with+keyPDF 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_off00011823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11823 10844 bytes
SHA-256: 17ce918da15a40569055c1f9db3577d19f54e954db2dc7f0dc81cedfa387ec82
font_01_sfnt_off0001314f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314F 20212 bytes
SHA-256: 5f4811c1e58a4ff2abd937b0680c45a8d777e6334685734ccbc7177576e9e89b
font_02_sfnt_off0001676b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1676B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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