Malicious PDF — malware analysis report

Static analysis result for SHA-256 b342e0ab9274b5b4…

MALICIOUS

PDF

74.7 KB Created: 2021-09-18 04:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ab4c13a642b777650ee283c6617331c9 SHA-1: 8f115c3376413c42e6168e880de76d7d32abd70f SHA-256: b342e0ab9274b5b4149105fcdc627b16ddf17519246804d2e89d984f033002c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://irlanc.ru/uplcv?utm_term=adapter+class+in+android PDF link annotation
    • https://catwalkdogcome.com/editor_upload_image/file/zemoburefut.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/69962092030.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/6667870417.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/kia4cra6c5hd9p13rdrnvf96gl/pofexisosanusojevema.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/bilubuturotumovanowaf.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/49737161211.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/25286656546.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/xixidezakubenutag.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/75558540673.pdfIn PDF document text
    • http://josquin-capella.de/download/nebekav.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/56998790569.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/97441297733.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210917055327.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33740583060.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/xerivaselefilugix.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/jifegotopugowipan.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/28379975645.pdfIn PDF document text
    • http://coachhouse.info/assets/file/zasoxis.pdfIn PDF document text
    • http://yuha.be/_files/file/99726045479.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/zijigamavitekubetituj.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/sevelogobosavevejuzozit.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340af39d96b---72409985333.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f616746c79---nadijetusenetu.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_off0000c032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC032 17400 bytes
SHA-256: c49a285a7e0bc7230b6720099efd2bd13b251893f6c11a23594a1a94f87324ec
font_01_sfnt_off0000ed3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3B 10488 bytes
SHA-256: 35e927e3cf7ef5273a67a7ef3ea193077f10357fefad50a048d63de9284f644b
font_02_sfnt_off0001052e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1