Malicious PDF — malware analysis report

Static analysis result for SHA-256 afdd328f23b676ec…

MALICIOUS

PDF

77.1 KB Created: 2021-07-30 20:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 922954d9f699b9c5edfd134a9e85f66e SHA-1: e5ea1ce1319b4d2acf122aa3158f1aba6e111232 SHA-256: afdd328f23b676ec0d65f15b01f5fa465a42d9c5ef85df908752b0a272aed358
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier assigned a high probability of maliciousness. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=asterix+et+obelix+bd+download+tamilyogi PDF link annotation
    • http://watsonwilliamsreunion.com/clients/82103/File/42229104725.pdfIn PDF document text
    • http://shepardfarm.com/clients/877021/File/74653647827.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/507a8a6c02a3c69b8aeb64bb10097ab2/97654615166.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160edd9057ec44---66625203986.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2b2d3fbf800aa0dfa629c71d7f53aa62/robenozivoxitur.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/732d81c8d6401f3c8f73057fcdd15bd4/numaruwubukigizupab.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/bfd0ff6b8ff9d2911302b35b6cd3794f/vuvidez.pdfIn PDF document text
    • https://luminex.pl/upload/file/83415840046.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/jelubatifilowatugedodit.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/35391101362.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075f8888f5e4---78882666529.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073564dca70e---sekazagerokar.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094597d917a2---43969371954.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/lejosed.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/bfbe88cfe7fffd3861fa00163325553c/93164163279.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/96gdas7cb2t1qkcgtnrnenllmi/balawokanu.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/fijodudubumibi.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/254be606dc792371d1610f752dcba117/16941054216.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/65505221483.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/8f7480e645e18bf0d77f4ed9f3916f45/xajigetinapepujutakejoven.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/97129484110.pdfIn PDF document text
    • http://allasclub.com/campannas/file/66839910715.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7afe8ddbda---76811289423.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/xunisebugafufotusasep.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_off0000caa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA1 16228 bytes
SHA-256: 871cea35a413506d7c26efe1705174deea6457293b225c08678959a2c78b05a6
font_01_sfnt_off0000f450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF450 11012 bytes
SHA-256: 7f5e633a24cb6751891c387289e8ce723cf26a2f74059d9626611615db30c90d
font_02_sfnt_off00010dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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