Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5745b0bc5e6ee42…

MALICIOUS

PDF

86.1 KB Created: 2021-09-01 08:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9dce07b7fd70fb7155919d867577a1cc SHA-1: d8afb027282c1f1a202e591d1f3f2356901f7111 SHA-256: d5745b0bc5e6ee42c2f53c2df669785f4cf2c19eb3d84d0ccd6226f18f8544c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs are consistent with spearphishing attachments used to redirect victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://oniceh.ru/uplcv?utm_term=how+to+make+wordpad+into+pdf PDF link annotation
    • http://a-swiss.com/upload/userfiles/file/275215823.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/43861221757.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/72127750009.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/51521996267.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210731140749.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/woxisobironemorelipuzani.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/biwamogi.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/9e73b419a5c4cfa8cdaa68305e30ade9/43088088.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611a0d03bac78---90426403340.pdfIn PDF document text
    • https://altaspin.com/calisma2/files/uploads/51605818080.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b87cf504e96---51902104901.pdfIn PDF document text
    • http://asustainable.com/global/file/73366009624.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/kefasevukuxal.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d60cc67eab5---69041350367.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/50158063207.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/a8641c872f75b2a8e8bb2ee67cadace7/40973461199.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/gomovivumibava.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/tafadurinirinalisamonam.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/lakeziretuwukupajo.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/8jk1n6bagbo92udv4ensueqf80/xanapubotuzefumevakawut.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/9e6c82cff893278e331aceed0267008c/76519115787.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/kujorefegogemurutijo.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4cbfc12bd---14595285795.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d94ded2839---22194042455.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c90f3e37d36---99249970282.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/p5jd6a88qaprpke7tr6326efa4/wokipe.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_off0000e813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE813 10616 bytes
SHA-256: b8653c74d2ef43edc0a971c2d662b8a1b6097601aa42fb26ec5b475f84e1fd4d
font_01_sfnt_off0001004c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001185e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185E 18688 bytes
SHA-256: 6f005875e821c68ede6c1c6355fc31c2070a46f4d1ad32afa21576f83ac6d800

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