Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67cd9fc70480550…

MALICIOUS

PDF

77.2 KB Created: 2021-09-06 09:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5c5801c8378d2acc579d689c3edd02ae SHA-1: 3a258b12f3f145038f33ffd0ecee2aae32541bff SHA-256: a67cd9fc704805501b30c7322b67427f91bc92cc8c11f4a44779b198f8b537bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lead users to potentially malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://burstallconrad.com/editor_files/file/rexupozerofeginimegari.pdf In PDF document text
    • http://aucoindeshalles.com/menu/file/sajefilazanowet.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075369c1ce8a---bibezebonilibifobitatix.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16093fc6eda9ae---98917694158.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/gurinikeda.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/172b2546b7af2e48e6aa4c2e7353e916/13156124017.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/49299379617.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/23116443364.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/6c0180b47ffc5f05b81a7b5d06086102/zepusutelezapexi.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0eef0d1e29---gisudari.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/xumaxofefapidevemirirobus.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/fusoxolazagilax.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ce6d75491---gaxivike.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/zamogolakowelubolevokolo.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdcd512ea1---wudivogusofowipaxuganafof.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/47372079335.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b53dca2e527---26337261289.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/ad548934f6bcc3284c00a32b5f8fe08f/kidugumowizijejowob.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ac2c654bc---kakimixezal.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/70532718949.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/bomowuxepurazufipa.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/81287149838.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/m9u34lu5sisum9au873srluq9l/3153967472.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/gorup.pdfIn PDF document text
    • https://impresa-valli.it/file/risinonikakutinaleteve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=creative+compounding+in+english+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_off0000c271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC271 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA83 18840 bytes
SHA-256: d755b624ad53ec8abf9c3d4d30e3cea9a9a930de93373abcbf2c44f8f75e9209
font_02_sfnt_off00010c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C04 11264 bytes
SHA-256: 60f4a8c88deee14133bc809cb2b6a5c6deb0bd355c1a69d2b9467982ef5069b2