Malicious PDF — malware analysis report

Static analysis result for SHA-256 1401ace2564b5878…

MALICIOUS

PDF

81.2 KB Created: 2021-09-12 19:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 62b7979538b1ba91660f1d458a235124 SHA-1: 137e216e3c9e03f0417f56d20b4723a6a01defcb SHA-256: 1401ace2564b58782a5cb6695fd998b52b1fabcfb5bd76f97c7be2bbd7aa5d66
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://goldmustang.ru/files/files/19326454657.pdf In PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/d49f88a9574bc1d73cf6ca8cb4cb1d78/nudetofamipagubax.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/89463097999.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/babafi.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/38326894877.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133132571fab---91444207225.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/fddfd9eade60d14c59b60a9f5fd46236/batokoxefonajoferodiwu.pdfIn PDF document text
    • https://orrizon.ru/images/file/vikazuzisizeziwagok.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/92381272641.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/jujakakupukegedaned.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/283eo67q1sr0nga54drqa5htr9/lugigofa.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/noxadeb.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210907151140.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be087b924a---renuzot.pdfPDF link annotation
    • http://lookkorea.net/userfiles/file/tumomejeniwukaxasuwovu.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/guwulumisu.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/fudipigidugukipividevetoj.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/jojiwupagujofo.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/vubanabokaf.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/midafafuluwog.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/vigisibura.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/jesadenujiriju.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/69437226711.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/wusemoxowekewemexaxogo.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/89737251674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=windows+8+pro+with+media+center+product+keyPDF 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_off0000d6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DB 17612 bytes
SHA-256: dc64575ae71aaf5255b606f2da3c00c7dbaed360d395819a31a7c6e9a35d6f6e
font_01_sfnt_off00010491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA8 11324 bytes
SHA-256: 9f42f5166c43f6ca2b564917efb624dd7e1992070835b06c9be57b63b104b8f2

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