Malicious PDF — malware analysis report

Static analysis result for SHA-256 5811b4d3aa120162…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 15:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 487165b0de8eab36dbae6b6cc03b13f2 SHA-1: ac8f89479fbf1f4575b8ec2dd2a0df54af1bd605 SHA-256: 5811b4d3aa1201622a1938c39028d3af012b934a18d15d5c34a84e1ebec480d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload directories, suggesting it is designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic strongly suggest an attempt to deliver a secondary payload or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/up0cbltmd73cdajdjljka17b5q/rurufulivatulupezagopo.pdf In PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/961c95d29945337fdeee3d01a08e5d7f/56011784294.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/moei15r24fkt60hidelbntcqq2/maxojod.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/s4i4otn1gl26lk45dese8sohss/99365456447.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/libivawufovenatibin.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/81639517631.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073e7616ceba---fafuligazajifu.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/6164bfb312e64df2dc83ef06246a6489/rolur.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/f4m9o4rpl2g50hr4ipmhnlm0i1/relijatenimekukelisaretu.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16250493468068.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/dulovoxipezas.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d766d81fb---15998092095.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/2663232757.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982e0c77972---84108638188.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/6cs2oo15tedufpoei0l2ph3vc1/jeneruzewoligoxuj.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/74469450247.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/35958161669.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/gofinavogeguxinedofaxup.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/veronolagobatixonepu.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/7c4bfc41fed131c34b6cf97cf5a33a54/75752598318.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/n62ifl8rui960iam6kl1pmhjtu/nejaluxedibapuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=large+scale+c%2B%2B+software+design+lakos+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_off0000d70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 10928 bytes
SHA-256: 719c746e512cefa4d59e6095b26d62a39064b77be03a6cc0971ab71101827384
font_02_sfnt_off00010867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10867 17608 bytes
SHA-256: 03367a59e2554859720962b633409b13ea852760586475ef092bdccdb3376003

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