Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93671fb83e0ba77…

MALICIOUS

PDF

70.9 KB Created: 2021-09-30 10:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7dd64992f532b2e6121f1da4a8941f92 SHA-1: c6573d6df70419465bc54ca5f392db0f0250ed70 SHA-256: a93671fb83e0ba774fa842a3b38227733809b539f49649be7f4f1b715135bf9c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, designed to lure users into downloading further malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=unearthed+trail+of+ibn+battuta+download+for+android PDF link annotation
    • http://www.medicellbank.com/userfiles/files/39991233449.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/leratevuvupek.pdfIn PDF document text
    • http://simonide.org/userfiles/file/bexagulivakazaxasifod.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/98574492946.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/3sm4fm6qdh6fk37k4ppbfvm4i5/28569342399.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/vumuxis.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/87428415608.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/riwilutufezuvigodalugo.pdfIn PDF document text
    • https://eltdb.com/UserFiles/files/61010349516.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153498cce18c---18406990599.pdfIn PDF document text
    • http://agro-norwa.pl/userfiles/file/moniwejuxevajosi.pdfIn PDF document text
    • https://sergiomauri.com/images/file/nanasarepegimulasuwe.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1ad60d2cf---govanotalu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614452fed5275---kobaxeliwisif.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/rogiwikelufamukumese.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/86630307188.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/12368542835.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/pokibitexotusanudadudu.pdfIn PDF document text
    • https://anpheatingandac.net/nbloom/fckuploads/file/joxew.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/76700085647.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/lijulipebu.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/9976092458.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/joviveritumazed.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/36117418246.pdfIn PDF document text
    • 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_off0000b119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB119 10616 bytes
SHA-256: a4ee932957ec581edc77cfb78bb01dad888e40e3d3792675517e2cbedba9d3f2
font_01_sfnt_off0000c940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC940 17584 bytes
SHA-256: 33413a581d19ebcd5f1729a6a9a880ab46f1ed42874a49b47f60c8f4fc0614c4
font_02_sfnt_off0000f550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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