Malicious PDF — malware analysis report

Static analysis result for SHA-256 6928c40dc894c11e…

MALICIOUS

PDF

88.7 KB Created: 2021-07-07 01:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7ba42862c46d46ffcb232afdff433ee4 SHA-1: c193a903b65e6e3bbc06e9abf2d7c75d88ffb8fe SHA-256: 6928c40dc894c11e57ebdfb0e7e08bbf376c999226e220cf3a9da70746166ffa
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/7mbjptpsjjucbn33lnd8apr2tl/6197059907.pdf In PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2d5f6cc79f9e2c6f4f84e7f852587494/nimetezetesatagowu.pdfIn PDF document text
    • http://toonesk.com/upload/lojelasijekugozolu.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/firilelub.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/joude39sbahiigic56qn801iu7/dijegawizevaku.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/44680128183.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/96e426b3d19b91760e47776a9239439b/radonuvusinogov.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/ganakijuvaziruwaru.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f453ba85f9---vowomigubakubabemoruzaj.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865c98d2cdf---53837352960.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/2921219ff014395eb71dc8464d97984e/60780299535.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/124aa2419111a5b718d1d917f4426d50/17965160670.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/zevizalumejim.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/56958755552.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/tuxewafipopudewonulesupid.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608e6ba521ad4---vizovozofetozude.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/824e03554b320a3f8f1ce73ad0b42d94/bilinulunilurob.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/zuvemagi.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/49236653865.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/9og83lsmufcfbuhms59d4ajqic/fodobifagotupeve.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/75c4524cfae615668bb6c202210437dd/41154303043.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099333a357f7---bukizugufokiropobapof.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc53f4c36c---51382539724.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/fimulagulavosutili.pdfIn PDF document text
    • https://deepex.hu/hirek/files/92116569327.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/10448893800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=w3schools+html+introductionPDF 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_off0000f7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AB 17776 bytes
SHA-256: 2246065e88573f33784259bf33efcd32f37d4c47943d58f279d6f8a1f553c82f
font_01_sfnt_off00012546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12546 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5D 10608 bytes
SHA-256: 65e54f4547da7b85e668febd2c1b51bb64d409f31607e02c437b41e17ffd85a2

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