Malicious PDF — malware analysis report

Static analysis result for SHA-256 156a7fa8ce19640d…

MALICIOUS

PDF

88.0 KB Created: 2021-09-01 01:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e1b81938169d9141b86df47b0ab22317 SHA-1: 3d8e6fb5796db201d86bc0abf0c4842a8865e95a SHA-256: 156a7fa8ce19640d5c71b0a44db6f9e0ee5cc9590e72a31c4a7ccac2e4422afd
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains. The primary goal appears to be phishing or distributing further malware through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.focitabor.hu/userfiles/file/69741809542.pdf In PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d14f30c8db---fojog.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/savinimim.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/sudugonadesakefojinaro.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/50801379267.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/baperabed.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3a6debbb4---fulujikuromokonax.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/39065303922.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/q7h7d0hdhgl4q46amk7gjnd592/66716259608.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/63678807458.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/senasimajopepifakev.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/32188173671.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1608c36f6d5173---turasapabowabulabovuze.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/16721602825.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/98112217932.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/niwudezilomo.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/c7ec3126a9a946589a92868c73b6dadf/18802241386.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/bjj21ln6dfun0i1dtd5jmdfo53/rikutawutiwabo.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/gasaduxetuna.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/46763254014.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/ueh5obdchagadulomn29f9ad65/65839936546.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/78772805851.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0bb17585ca---11039795014.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/vifopejijetafuw.pdfIn PDF document text
    • http://foodchemsino.com/d/files/ponunezuxaleg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=captured+meaning+in+englishPDF 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_off0000e86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86C 21740 bytes
SHA-256: f31245fb3c9e5c0efc42d06771b3a73608ee2e3955cb30c074e9c36fb074c8ca
font_01_sfnt_off000120c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C0 10848 bytes
SHA-256: 576aac99ac3b2c6d9848d4bda17127395b63831ce6cb4c3c04e5d84b50823b00
font_02_sfnt_off0001395b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1