Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff85271f0cca7b12…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 13:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cab5ace3a8973bd089b98c51f784340a SHA-1: fa49e7b4588dbcd95e4cc054b8e1af00f3e6a9bd SHA-256: ff85271f0cca7b12b7150ed800cada55c99d977b26aee51c493adda6f554b265
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. Heuristics indicate it functions as a link farm on disposable hosting, likely directing users to download further malicious payloads. The ClamAV detection and ML classifier strongly suggest malicious intent, aligning with phishing or trojan delivery patterns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bloc-immo.com/images/luwedokojufu.pdf In PDF document text
    • https://divinenine.net/userfiles/file/kexafilirizubolurepizis.pdfIn PDF document text
    • http://corkpotters.com/images/10170847473.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/89741967461.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/puniwanikeniwomu.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/18244827728.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d79d5461d5---zizabojotirepifoxa.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/vuzanuxupisox.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613773a25e790---61027504212.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/jevedasip.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/goxekaforuminazokesapinu.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/59393705079.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/62109690635.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/kabusi.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/75087607320.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/lamevo.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/jezifuvasu.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f69e1bca9---sadakivigixesepusofag.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/24742910151.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/vunajutepuzufago.pdfIn PDF document text
    • https://rinducm1.com/contents/files/78729592676.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/19989c06843fea058d752fbbc868f479/fupesadawenaretufoxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=flat+icon+pack+apkPDF 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_off0000d8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EA 21040 bytes
SHA-256: 8309220a0e0201e49c14ffa2690521b62f73cd9c91e50ee0609ce66c55f8f08f
font_01_sfnt_off0001107c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12893 10036 bytes
SHA-256: 26c3ffd4e407fcfacf1217ac5f3c88000fddfa4b04cafeb213e9197104b19f3b

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