Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c127a1bdd9f3d6…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 12:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1723c1ecc40ad411ff8b4eaf08c434f1 SHA-1: 5bc903a50ce328ce67e215f41315cb055ade7aa5 SHA-256: a2c127a1bdd9f3d6ee400a5c6749f1f0180377b623c2fdc520e1fab18f857900
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous links to external domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The primary purpose appears to be directing users to external URLs, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://asset-books.com/userfiles/file/32275340025.pdf In PDF document text
    • http://chixue.com/uploadfile/file/20210818091249.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/33215921653.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/c019303d80cce98443913d9027dd4c1d/jerutazivuviwodepi.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/gawesobipal.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1895a0511---xubefixidokafaki.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075a5b5979a1---45268238094.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/xololisewexulupapivu.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/14102738050.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c63bda9d81---kodimevibisebufonumege.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/velakisifewonixanoxu.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/11839704823.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/57348593953.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/dajekinibogaka.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/riwotitowajefup.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/faxes.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/ec53bafc6cf4be973ecbed1034c58ed8/16104306610.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/bef93ca28bfcebd6314b9df887dcf1e8/gikokemosoti.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/88043685412.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/7508512142.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/75155549590.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b388beb5a---37633714387.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/a6q0fi2r897outqpreo8l5q106/69439376100.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/0be2c5d95805d28563bfa46a5fc7e15e/24583978257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=gitlab+squash+commits+manuallyPDF 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_off0000da5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5D 17780 bytes
SHA-256: f7578d541d5ee87fe524bea8da970095d6aa38b741d7d2b8e549a82a32d01743
font_01_sfnt_off000108ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EF 10800 bytes
SHA-256: 84710de667fec7f99227f0b019c6194e7090d3c82309eecb5c4cfd21c5720161
font_02_sfnt_off000121b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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