Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b3bcd4fe311dbe…

MALICIOUS

PDF

81.0 KB Created: 2021-09-05 09:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1ba0b778b75c7e3882de590536529be3 SHA-1: 254e7094c8cdbb4d778c17e3718e2956078a418a SHA-256: c2b3bcd4fe311dbebd4cc67a530482f5c567dbac39a350eb9b03caa1355c519a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, hosting numerous PDFs on compromised WordPress sites. While no scripts were directly extracted, the nature of the links suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d19c55591d---delajobub.pdf In PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c877c160419---25388530752.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/33590181732.pdfIn PDF document text
    • https://silga.ca/userfiles/file/45267508852.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/72b3713db503a60ebcb5ffbca1169b83/72357367969.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/dopamovijit.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/45487005941.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/23216861018.pdfIn PDF document text
    • https://sealskinz.ru/files/file/10131988677.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/jagexajemubiwuwazajo.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/tugalovu.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/54955753356.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/vifov.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161312e5c4c85d---vepuzadudupudow.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16086861be456f---86043313276.pdfIn PDF document text
    • http://www.ghidmariaj.ro/app/webroot/files/ckfinder/userfiles/files/62094979553.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/0618e211cfed37ee30d7942f1d6e5530/kitenosedotezubamexata.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/gatukajofo.pdfIn PDF document text
    • http://tai-group.com/upload/files/53532724430.pdfIn PDF document text
    • http://novichiha.ru/pic/file/36498175704.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/b8d3fb8debd766a42dea68b6b28f5599/dewuxu.pdfIn PDF document text
    • http://modern-pro.ru/files/file/7471126047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=nissan+altima+coupe+3.5+manualPDF 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_off0000d373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD373 19008 bytes
SHA-256: dfea37bc11b87050db06df71b3fc414f9fe8267377fcb96734873d59ab771769
font_01_sfnt_off00010571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10571 10884 bytes
SHA-256: 3c1e701165c272ada8a5cf2f3e1303ffcb93b26c735ff5b0bf16b3dd216f54dc
font_02_sfnt_off00011ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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