Malicious PDF — malware analysis report

Static analysis result for SHA-256 755ee5e59b0e4cc3…

MALICIOUS

PDF

69.7 KB Created: 2021-09-13 12:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 99740ae77a02a530ab8c32090b5b0e1b SHA-1: b7a3f835e3e3d10e7f18be45e5b436b4ccc0a0d4 SHA-256: 755ee5e59b0e4cc3c8f2fd38efd86eed162dc5d0324a008b5b0f8ced183a1ca4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable domains and compromised WordPress sites, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the structure and heuristics suggest the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://accessiblevehicleservices.com/userfiles/file/wifegasivujimoxonil.pdf In PDF document text
    • http://hoya889.com/upfile/files/20210904001720.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/garonavebezodibax.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/wararewakiw.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/ridavezowodopa.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/91711658246.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/vovawagavabakararota.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/tigalafabobexuxo.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/fenizomug.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5141afd401e13eea42e9906f8a19f4b3/32214220551.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/matujekuwomizuzapewesi.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c493debba7---38304922295.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/tubemaremononinarebi.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/pazurore.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/bozelozunu.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/vubiravinipowes.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/fukepem.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/kuvolofefenanope.pdfPDF link annotation
    • https://encoyun.com/calisma2/files/uploads/21135491424.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd7c50e688---tuwixokame.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/45194050248.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/9074042024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=offline+fps+games+for+android+free+downloadPDF 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_off0000b1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A8 10852 bytes
SHA-256: d742546f38bce10076533fd3d903025d8135776aa07f7186a63c202fdcfd68bf
font_01_sfnt_off0000ca7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7C 15272 bytes
SHA-256: 3d1989ed2584e06b2ad6023296673c4112555b55dac6147f9a07c3f3318ad8e0
font_02_sfnt_off0000f0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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