Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84f46b61d6ccb77…

MALICIOUS

PDF

82.5 KB Created: 2021-09-03 01:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3e827a762ccf8d418d5c51e021af6e9 SHA-1: 1f6e92539c7889b51367196f78e196b7ed03670f SHA-256: a84f46b61d6ccb77c0d8f19447a1be8228de2065f64dfed7ed885f7d02e859b3
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, with many embedded URLs pointing to other PDFs hosted on compromised websites or disposable domains. The primary attack pattern involves luring users to click these links, potentially leading to further malicious content or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://odesignlab.ru/admin/ckfinder/userfiles/files/64977851457.pdf
    • http://expertsystemgroup.com/file_media/file_image/file/molomiwugoxivisuviwutib.pdf
    • https://sgotomotiv.org/upload/files/jevupaguv.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/274d6685895576fe6c5e927fc449c4f6/79595867390.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609328df632b2---jazagafidazazo.pdf
    • http://porpora.biz/imagenes/imagenes_contenidos///31669478037.pdf
    • https://odlingfamily.com/userfiles/file/17037704104.pdf
    • http://bscartridge.com/pic/sigabafugupuk.pdf
    • http://pratiklinik.com/img/userfiles/files/29033868797.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/c749efeb24303aad62c55c408eb0682d/nawuluve.pdf
    • https://groupunsur2.com/contents//files/89818161940.pdf
    • http://altaprecision.com/userfiles/file/fidaw.pdf
    • https://eko-briketes.lv/userfiles/files/58093705349.pdf
    • https://stdtekstil.com/upload/ckfinder/files/2782740370.pdf
    • https://alakharia.com/public_html/userfiles/file/88694051836.pdf
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/setegipuwigabelerik.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/58r5ird444iisdvnousulu3s6n/99753113360.pdf
    • https://franchisefarm.franchiseharbor.com/files/files/8076518870.pdf
    • http://banquat.com/userfiles/files/27768757257.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160887ee542a0a---67000716663.pdf
    • http://vhshf.de/File/mijadabu.pdf
    • http://gsmontaggi.it/userfiles/files/pogekonari.pdf
    • https://manenshop.com/upload/files/vapubonupaludiguxugik.pdf
    • http://thevelascofamily.com/clients/11614/File/7437218232.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e9155abae62---matevopim.pdf
    • http://bluecars.pl/userfiles/file/69914375301.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=malaria+in+ghana+2018+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df4c.bin
b3eeedd399977a1485d7b3e31a33a37d01f9d1e88d4a63f4e442cd8171a09a4d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4C 10752 bytes
font_01_sfnt_off0000f7be.bin
da769ac5e2d9c97b7882497990c632a4da9f3f257eec1b373d58edfddb29d56f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 17444 bytes
font_02_sfnt_off00012496.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12496 16792 bytes