Malicious PDF — malware analysis report

Static analysis result for SHA-256 575085a99c805837…

MALICIOUS

PDF

82.8 KB Created: 2021-09-09 02:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 578f3695391a6044c7146c340820a103 SHA-1: cd32f475cf460fbaebbc22a0bd22c6d7fcaf26a0 SHA-256: 575085a99c805837321d9fff4698788e63124d4d7533aea333ef9a736a9ccca9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, likely intended to redirect users to malicious websites for phishing or malware downloads. The presence of compromised CMS upload links further suggests a malicious intent to host and distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=lightroom+apk+unlocked+download PDF link annotation
    • http://ettorebelfioreliutaio.it/userfiles/files/repegata.pdfIn PDF document text
    • https://strechybenesov.cz/content/zapezed.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/8243991455.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/f7c5945d2ba0bb0c57a032a923d43dd9/legatasukofajutafen.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136122d4c903---babeladagaboturidivura.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/53982029355.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210902125911.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/38733648543.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/74603119636.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/48401876106.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/28348462183.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/gatakuzijebifubopag.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/55715935938.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/42688496074.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/17942920767.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/96044780658.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c1193afd---felizoweti.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/nafazabebusozunakoga.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/jedajelaloti.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/tatejirebus.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/85717576739.pdfIn PDF document text
    • https://duvanco.be/docs/files/68384695744.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/84742676391.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_off0000dd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53F 11028 bytes
SHA-256: 037ef396273edbe0814bb6328001667f640ba48f3b7bbeed8120255589e136d8
font_02_sfnt_off00010e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8B 18160 bytes
SHA-256: a5dc77357c4c70c5ebdd5d65dc58b833165253da728577d7d917b4ae1c1f7ed9