Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a44b44e03d48b7…

MALICIOUS

PDF

74.8 KB Created: 2021-09-08 01:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f86e37e0ff4bf1981e6fc372d18cdf4e SHA-1: e0e852a3ac0c560916cfab3392440038ce3807d1 SHA-256: a8a44b44e03d48b78a2a277cb3d9667593607292b75489cb65dc8a2b2b933232
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://mmdplus.com/userfiles/files/20210721_091453.pdf In PDF document text
    • http://posekatzahradu.cz/files/file/34702429142.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/de8a364e55c84fa169f80e08df29bf23/fitesalabi.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/42362716674.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/nuzofixifawagokojipusaw.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/55572668954.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607955eb5d62e---zezokavoxur.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/99545904847.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/viselofe.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/buzitovurogukadetamumizej.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d3cff11d553---gipilajojajuvujofoz.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f1cfd2db7b---9708617829.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070eba43bc72---44341150339.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210608_792B66E55AAE86F4.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/f7a87fabd269a6f224855d476ac5d568/vomivamabox.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/91caebeec4a575ac06c1f8a807af1156/maporubarivasixepi.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160885573e9f0e---9843721784.pdfIn PDF document text
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/73923339655.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a992df666bf---68483831992.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/d43e3471fcaff8ed78ac7df65ba33001/39535809463.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/xazodekolusavigokanu.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/jejas9ndpg79dmqb83g89n2ib2/65172889011.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/29051139986.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/kiwifudopirul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=power+hacksaw+machine+project+report+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_off0000c19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19C 16080 bytes
SHA-256: 837f9e83c5566999cd68719b5187b786fc5a9ba7b881966eabac66c2c92d27ee
font_01_sfnt_off0000eae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FF 11148 bytes
SHA-256: eb25f934215cb2b05cd1f1c53c31e92d31110a1ad0c4714a8d1d650733ac126d

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