Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97b2e91a195e7a1…

MALICIOUS

PDF

78.0 KB Created: 2021-09-04 11:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7754b22000199d8847f96be205254a0b SHA-1: 33363eb70f6df7122213920adfebb375f0ba37c9 SHA-256: a97b2e91a195e7a1a9e6b7afe4969721de2460d8f9852fe297b3f25cb98a9968
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on potentially compromised or disposable domains. The presence of a 'download button' heuristic suggests a lure to entice users to click these links. While no scripts were directly extracted, the structure and heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://autavrabek.cz/obrazky/file/femuxuwiwijapizuna.pdf In PDF document text
    • http://riverside-plaza.com/upload/userfile/files/70002684767.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/nugetetijepizi.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160805266a22fc---4999903303.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a988ac7847d---zuronapepimelifo.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021768568016.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ccab3a48f---46282660647.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/1301234018.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/73194778933.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075d2b0128c4---75857724112.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/majisaretutul.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/67326399454.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/midisisagabugodisa.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/petalobenekapamemuzota.pdfIn PDF document text
    • http://sns.hu/_user/file/40503930698.pdfIn PDF document text
    • http://vodnik48.ru/content/file/15232487896.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc26909201---xutisolodetibidiwevav.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/8aa8b8fae86e5c09dc114321d06a0ed6/22166559747.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/se7ha2su3fvkapf067vplri9j0/1696989094.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/37685274036.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607499b079ae4---tewokex.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/64632003997.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=phonics+s+a+t+p+worksheetsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB06 17828 bytes
SHA-256: f3c9b5068e74902a92f208a082e9dedd9c4c84d28be2b5eae64e9a86674b2c6f
font_01_sfnt_off0000f993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AA 10604 bytes
SHA-256: 04500913e91c673210ca4167b275d982cc30063b77a23114eb3ee4573ef00158

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