Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c729436892282c…

MALICIOUS

PDF

72.5 KB Created: 2021-07-18 18:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 246e6457859d2544deabaf74e163a1b4 SHA-1: 0f7f6187b4f38182c0c8f5ae24703c1b9f911943 SHA-256: b7c729436892282c0a4fbfe17d4509ed19566beee8f0ef9c2e4e9fbf2815a297
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites, indicating a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded JavaScript (T1059.007) suggests the PDF is designed to execute malicious code, likely to redirect the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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 http://birkhoffhi.com/userfiles/files/zufasabeda.pdf In PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/e72d5f78151393211cf8baeb678830e6/pomedeginosagibolim.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/1ftnn9r3oaulanfst58i5c80tv/kisubulebobutuwul.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/25076366215.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/4647a989c5400a4a4de552d3aeb2a24b/rukab.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/zegexadowadefixejada.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/xofewovudelibefadifeva.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/14n5k01ep8lbfneei1rk1gd8od/sogofetofotuguna.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/vtqn1984j9lsuem9e1anumv6n1/37016825673.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/zogapunifelatumolor.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/78905145319.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/84595927197.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/34373210223.pdfIn PDF document text
    • https://people11people.gr/uploads/File/40549411194.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f169b71803---67508105964.pdfIn PDF document text
    • https://baongochoa.com/upload/file/30515345012.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609847ea63477---71387899539.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/if3ejm4flgfu5juplm529qgjt7/90674535747.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/xetoreses.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/s2r1v3hkjq18b4eh0o8lqjc7pl/zuvekus.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/ii5ucs7e88s01c19lhgudoq3sm/79941840925.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210604160031025.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/7611354990.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609b01fbabfdc---kanatosunerozidipoxifawod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=philippines+two+letter+country+codePDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/9bcdf33cc3917ac4d56fc0f8cd414659/23029377930.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_off0000ba4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA4F 10752 bytes
SHA-256: 119c947edabcc7c920989d57f76e66452d67f9d8beeea5a1f879e8d55f430cc9
font_01_sfnt_off0000d308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD308 16264 bytes
SHA-256: e762b8f9e4708ba5cdca25b0494c1965703e0c9f0723f0c242e64dc0aedacfb6
font_02_sfnt_off0000fc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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