Malicious PDF — malware analysis report

Static analysis result for SHA-256 0adc2d345f1e88cb…

MALICIOUS

PDF

78.8 KB Created: 2021-09-16 21:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c4a221807603309f780e723353e7af69 SHA-1: 0f55042faced167629f98dd1a44d23db70de710d SHA-256: 0adc2d345f1e88cb48dcd1424638b5098f72b80a2a2e7cb631f613fba5ec09fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a link farm pointing to numerous PDF files hosted on various domains, many of which appear to be compromised WordPress sites. The primary function seems to be directing users to external malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://study-go.info/wp-content/plugins/super-forms/uploads/php/files/5c8301dadca079ccd9921b179ca86b09/rivinijax.pdf In PDF document text
    • https://djecijagarderoba.me/userfiles/file/60918185825.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210911210304.pdfIn PDF document text
    • https://norservis.cz/files/files/38224822917.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/72418739575.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/28800995764.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1631209928.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/6584783384.pdfIn PDF document text
    • https://songhongresort.com/img/files/lewiwusanitowifiwox.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/zelusukujuzatibilametutu.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/mazakidofovogesim.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/vofafelut.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/6ornnei95hn7jr4hn5idtqjokm/36269384681.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/suwalusez.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/29138565330.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/tagagikaligosulubitineno.pdfIn PDF document text
    • https://htchninc.com/d/files/sebobozibuzekav.pdfIn PDF document text
    • https://lorus.rs/files/xubid.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/a2e6f9725b7380c7f340d7859e770484/73397952362.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161417219e55ac---pafitojojexis.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/tibanefunosenozeni.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/98751621796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=list+of+wind+deitiesPDF 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_off0000d113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD113 17532 bytes
SHA-256: 0b525f67d9a96ed2febe0a7185eedabf8ef3075cbc83c5c3846755d8555e2f69
font_01_sfnt_off0000fe25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE25 10084 bytes
SHA-256: 0cc55171113b981edc66813dc950b9a38278a2032628c425f63ba7a39fb3c6e7
font_02_sfnt_off000114cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1