Malicious PDF — malware analysis report

Static analysis result for SHA-256 8007a8f28f3a9bb0…

MALICIOUS

PDF

78.8 KB Created: 2021-08-28 22:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 467daf02f798cf40ef34ced806d4f181 SHA-1: b4b562a1fe82b196920e3d8ba5e39cd124806328 SHA-256: 8007a8f28f3a9bb0b0971afe2380abe8a7d3b03aba63addd5b4c509c03469611
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external URLs, some of which point to compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a primary indicator of malicious activity within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a119ac21d1dc790b57e4085f81364a55/ximogawoguzosilujaluda.pdf In PDF document text
    • http://montesantangelo.it/files/files/6330739486.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ffd58b48f85---gilaju.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/21324351250.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/08/06/32845688570.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951991dfc8f---lajodotagufodedozajafaga.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/60827680888.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/13bb82b6a2dee88cd0268ffc429b2ae3/lilinurunulewerubelan.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/famamogijijalenuwetuf.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/tajevibana.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e91dc2e0a23---42860912921.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/vowojaduxiruburesokokuli.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772ede14ee0---misonomozebijujedatugezag.pdfIn PDF document text
    • https://atlantidegattico.it/file/6247811124.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/gozobiberijitagaj.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/tixiretabivokujinomudi.pdfIn PDF document text
    • http://mav-auto.ru/images/file/15675772505.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/serigekabaw.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/62322839815.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/sijuverezonunudixowuj.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079e4d1b4e83---24851854370.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/guxefibegumofev.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096e7a9e7236---55391577709.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/nugajupukovexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=algebra+exercises+with+answersPDF 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_off0000cfa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA3 10696 bytes
SHA-256: 5a49abaee006fe8bfa8172addb755d9db5f7142aec6802380f21a033c3e90602
font_01_sfnt_off0000e835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE835 17360 bytes
SHA-256: 7f1e9a17bf72b0e49a5ec17739bd7ad14112732d3e38c8a39c5dfeca693d506f
font_02_sfnt_off000114b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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