Malicious PDF — malware analysis report

Static analysis result for SHA-256 554db7b629194d9c…

MALICIOUS

PDF

78.7 KB Created: 2021-09-19 16:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f2518f823a2d34014f36ef63eb74e28f SHA-1: d5dee98cac99bff37c6e75509e1d45c2e1633c6a SHA-256: 554db7b629194d9c26c1b36be709712e4467c9c47160f6d09b386d8bf85f5781
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics indicate the PDF functions as a link farm, directing users to various external URLs, some hosted on compromised CMS platforms. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=redmi+note+9+pro+max+where+is+fingerprint PDF link annotation
    • http://cmrivestimenti.com/userfiles/files/14984303695.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d597641e1d---wusadodizinixufuf.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e106812e2---36012696938.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/zezasizuvemujogazabe.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/tivepifuzomixegexuzel.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/33232753826.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/xuwanodiwavud.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210917003652.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/kavafe.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/gobedekoxadowike.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/30212425316.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/25213197747.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/gewopobupidazolukivar.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/wozup.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/garaxiraluxi.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/26076287284.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/naponagofelixinoni.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb71b11f5a---mekiritipoj.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/fabikujuvat.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/23610215950.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bad102b90---68236694524.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/xadoz.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/jedipipobe.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613f031088935---21466995207.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/tobidijoboganusunisoxal.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_off0000ce88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE88 11300 bytes
SHA-256: 4c7e9fd09f747eda5040328a83c1a4d0250b97ebee2139888de429342bf7342b
font_01_sfnt_off0000e8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DF 16916 bytes
SHA-256: b1891f808abb6a6370f9d9d1f7acf07b1c7c7cc024ef0eb8cdc207a34c7292c8

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