Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e797f7cc5f8419e…

MALICIOUS

PDF

104.1 KB Created: 2021-06-30 01:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e8daae0b7d5713fd98199eef1d98c310 SHA-1: 8be227ee7411d65f497a9d74e703d0f520571e3b SHA-256: 7e797f7cc5f8419ef909d44bb315a94d45ab0bdde902ae65bbeddb5bb6654b33
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including links to compromised CMS uploads and link farms on disposable hosting, suggests a phishing or scam operation. The 'SE_CALLBACK_LURE' heuristic further supports this, indicating the document likely prompts the user to call a phone number in a deceptive context, such as a fake billing or support issue.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://ketchas.ru/uplcv?utm_term=jupiter+does+it+have+rings PDF link annotation
    • http://dermaktif.com/imgup/file/suzoxuj.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202162861432515.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/buvafolu.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/17699911967.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/27187812559.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-15/20210515120149942486.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073c39e9886b---32133859732.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b63b47796b8---78081430703.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/8867868099.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160822ef72ca9f---69456871268.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a5ca6cba4---89100339635.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/sositilitanezaliwutebovi.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/a7aea80d686b1202fea17c4645927936/nudosususib.pdfIn PDF document text
    • http://benrassam.com/uploads/files/zesebixobade.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/8359268fc92ab420aac1c5d6c3e65b66/naraxikos.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160acad8a71b69---towilarimunoxisunit.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160af67d61b1ee---gukazinofaralixopoguka.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/madevepisivawa.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/hk51arub8h16b987n7butue2v4/99537383488.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/86457895523.pdfIn PDF document text
    • http://shiksha24.com/userfiles/files/luxofeluwajedabefeki.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4a51417f3---90806373139.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077f35c3564e---gajopi.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a248e50b1---tozepilebukiwetivo.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/wuveteluduworejasuvive.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_off00013120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13120 18456 bytes
SHA-256: 42f52518960e8f6189f6c9e4823a470ad5ce9aa33dc31bbf745dd7264e5056be
font_01_sfnt_off0001629e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1629E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AB5 10780 bytes
SHA-256: 2180d80f8202a7bb8bf27c45bcaf9272f7a69f005e0196fc6f7a996ad32209c4

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