Malicious PDF — malware analysis report

Static analysis result for SHA-256 55da18dfbfc7c5ed…

MALICIOUS

PDF

91.4 KB Created: 2021-09-02 14:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: da49d08281270ddd92171830a4b46e66 SHA-1: ab6debae1b0216734b9d00d0e4bac2374408b7e1 SHA-256: 55da18dfbfc7c5eda7385f9706f56a87a4a53127ea3829a8e600b6b7fc57b9a5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure point towards an attempt to redirect the user to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://allytemp.ru/uplcv?utm_term=wabi+sabi+free+pdf PDF link annotation
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/e24e4830b729bbd6514d354d43100f02/nexexeviparanodekijo.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/xojifoxiki.pdfIn PDF document text
    • https://orrizon.ru/images/file/rimifijomelagisewosepoter.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab479c0f9b---15411422332.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/d05c4b478aa3ee2445904e6c10a42e07/sizilivifanan.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/4f1f33d26977aa17a7171e7daff515f4/93219335891.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844af6b883d---fitujama.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094b9bc853a9---garazaf.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-24/20210524012329390620.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/394a1d4b0481d76a882044dc434b4a9a/25790210036.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/3547319046.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/66849724651.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/b0soglfrh6kkuvsg8ahb1j9g53/68721444742.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/fedem.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60b2a4e8192a6.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/772af12e9c613a3f988089a9f0c1c425/47680232044.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/c3634da86a7d31bb33b572de4ed4ec0d/latilalozixejidubisogofa.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/8f7955590d7369025aefd2948287d225/wogose.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/zavetetirikanupirekijenag.pdfIn PDF document text
    • http://140.121.176.106/ckfinder/userfiles/files/83502971650.pdfPDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073683bce7c8---rubutorafosotapumudotimam.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_off0000fd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11553 19864 bytes
SHA-256: 67c24136e72b36e9aef1190e74388bbf6e9018d4bf955f49fa80125efdd1e5c4
font_02_sfnt_off0001491d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1491D 10256 bytes
SHA-256: 141fee86e61eff78663a61b1ee6fb279bb7dc808013860b2f565bf602736f796

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