Malicious PDF — malware analysis report

Static analysis result for SHA-256 46b4b0d1d9ebf4e4…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 08:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a086f69a6ca8c8c17943a5ec262aed0e SHA-1: 83fba0b7c57b407a5a5738fa7542e09593d5a775 SHA-256: 46b4b0d1d9ebf4e4108703c16558e9b0b6723e62ebddd25fd0893b43e3a1b41b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs and links to compromised CMS uploads, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript, though not fully detailed, further supports the malicious intent of executing code or facilitating further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=how+to+call+a+number+with+an+extension+android PDF link annotation
    • http://sdds.be/userfiles/file/dixupufomota.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/zisigejumolufuvazaga.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/welajirubuzixi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e40a3cab4---4388464754.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/sajedawuduvegetunijegumal.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16140c68a50984---59159941708.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/gotizuxupekelofe.pdfIn PDF document text
    • https://izometal.net/mm/file/tapomigigokomufope.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/23875929682.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/404e49ea2512df0806f809f65704c003/fopivivu.pdfIn PDF document text
    • http://tulga.ru/editor/files/45914216624.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/6238531817.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/60064189184.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/furete.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/45017638795.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/bowikenawelumon.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/figipor.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/74978673846.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/12848117295.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/85338440147.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/tovam.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/51141539815.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/joketazegupoxurirebozajub.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/nodosuvopugobomopesifix.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_off0000db3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3F 11056 bytes
SHA-256: 1b062a4acd650574d255178a0ae389ce20a914e74c0df3c7ba57ee5c8763d2ee
font_01_sfnt_off0000f4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDD 17140 bytes
SHA-256: 46dedac595400d8e00765f0951fb6140d2a219db884e18621ccf709f593b5544