Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4ec9b7fa3e4ace…

MALICIOUS

PDF

88.3 KB Created: 2021-07-06 19:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 416a6ae54050c83f9108741f1f953dc9 SHA-1: 3083add4e4462db5242652952262b8cfa4245142 SHA-256: 0f4ec9b7fa3e4ace5b52f17d3a3313e84b019f78b356033994ce37469575a314
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these external links. No scripts were extracted, so the primary attack vector appears to be social engineering through link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://motacademy.it/file/zivufe.pdf In PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3879a3deff---somakidot.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/9637284670.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/653fb2e65a5b656095e7b2602c68fcb2/10026114111.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160923733c6d79---6484400155.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/728d9b0b5f125b2fcd3a10b508e82caf/filavevu.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16092770d7bb31---fajulutoravew.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865684a3c84---20960894389.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c8596680d---84469468058.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/fbda2972f2e8876f702a3b95f20cc8cd/zadetaw.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/807347552ffef5a2956639a9c23a5d4e/sedoti.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608180d509b71---renaloraj.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841006eb736---42777536555.pdfIn PDF document text
    • https://tmtteks.com/files/1037117340.pdfIn PDF document text
    • https://educhina.mn/editor/files/4364973854.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f57aeb395---19234849138.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/sazemilo.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc66f1efa8---71753695223.pdfIn PDF document text
    • http://mobilenmr.com/files/files/23096593647.pdfIn PDF document text
    • http://alptw.com/images/files/9584853374.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/xenotuvejixisowedefopi.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/rudave.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/36e2072b02f447da1441ac714b06d85b/28483143711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=non+contagious+infectionsPDF 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_off0000f88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A6 10444 bytes
SHA-256: 06f8e636be1d395752df642c952871c1b314ceeaed52dd6473745de189aaf4d5
font_02_sfnt_off0001288a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288A 16756 bytes
SHA-256: 6e8adb54d16171eec84b152e11cfdd6020b7975c3d95d93db34aec4dbe4f5e7b

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