Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f44fab7c07f700…

MALICIOUS

PDF

83.5 KB Created: 2021-06-26 02:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c7b3df58995670f6205d4c09eeeb174a SHA-1: 56891432c5545d63c604a3eb74c1f713aa8f7de4 SHA-256: 27f44fab7c07f700aee718103a512bf6fc5446016223bebfd532616a8b9e20a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, directing users to multiple domains, many of which are hosted on compromised CMS platforms or disposable hosting. The embedded URLs suggest an attempt to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://hgb.se/filer/file/62062648652.pdf In PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/23477743965.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/41b0a35f9feca1bf297404211e294e84/tatejimijiwevedino.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/53905573301.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e71e9a53b---15421774245.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/85446851633.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/jolifabezoridipix.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/45148325410.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/1928196084.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/12078933565.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b593250ff02---piragavo.pdfIn PDF document text
    • http://ihdbd.org/upload/files/jazomawaretefuni.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a73e5e2f1c9---badimurafakuloli.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/netabapeviriniwovopefub.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/1472f582fe8b0ed65c80479a26356456/nekekazolexidinoped.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/d6if6mbumqtlcl52c5d74he7m4/wajiza.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/50277170513.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/dbc9ad43d015cbfdc20d5da38581cf69/13592841069.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fd6eb3a2e---56607828945.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/53977027917.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ce0c91184---juwax.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e1b823cc0---bivagul.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd7cc00b05---xuwejunoburomomame.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/31172305862.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/82090920595.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+save+an+image+from+pdfPDF 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_off0000e1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D3 10940 bytes
SHA-256: ca591cd6bccc307bd71c56e23e42a15db6cf9aa1abcc8c5586a58785fe9971fb
font_01_sfnt_off0000faf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11309 17276 bytes
SHA-256: 7e22e01462ba7e54e03f6c9b7a3afc391b141d07f00d73e1804e04db3d1cc322

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