Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b631ac3bf403f06…

MALICIOUS

PDF

75.0 KB Created: 2021-09-03 01:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 00fab729ae5d9d3766714495efb6d321 SHA-1: a3979067ec2f37fd5f6e8099ef55febbcb582d60 SHA-256: 0b631ac3bf403f060a7a89098d799c8db89d34e26967fa0e28f29a75671854f1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous links to external URLs, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/wexixebaziginepojuda.pdf In PDF document text
    • http://comp-art.ru/userfiles/file/jokejubozudifiroxamuzede.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b432b40303---womevemamikudebefewi.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/fsmkkq6t7b08se3t98bev645dj/85852516981.pdfIn PDF document text
    • http://df-foundry.net/d/files/zanuritab.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1611551331b5d4---diwaxavadaz.pdfIn PDF document text
    • https://congchung7.com/upload/file/49382314694.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/53305432103.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a29d42db75---5700156403.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfd0adb336---76022026392.pdfIn PDF document text
    • https://asiapharma.la/files/files/lodabojafogip.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/xikeroj.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/f1197aa91911b034cda4f53213e16ad1/kamagapefipofitilegaben.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/ninedinalatux.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/19492848922.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/70052459147.pdfIn PDF document text
    • http://chipmax.in/chipmax/ckfinder/userfiles/files/vovowufegu.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/c6d34b2cfa5115fc34eeeda4fd15d164/fifobobuxavuxu.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/39763872928.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/87469994582.pdfIn PDF document text
    • http://abnicum.ru/files/file/72741444616.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/banomodinulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=kebutuhan+zat+besi+pada+ibu+hamil+pdfPDF 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_off0000c3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E1 10836 bytes
SHA-256: bf08fc8982c69f8fa22f3227ad415e555451dc9f1e84b686e2370ea7e901ec53
font_01_sfnt_off0000dc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7A 16204 bytes
SHA-256: 10f662b5cf13082c852d6a5bdb0baedcccec651b75f33ee3308441aefe64c2e7
font_02_sfnt_off00010631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10631 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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