Malicious PDF — malware analysis report

Static analysis result for SHA-256 adda612ba67a5ec8…

MALICIOUS

PDF

96.3 KB Created: 2021-09-18 15:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1c36fb10a0da045ef6f52045a8336f34 SHA-1: aec32798086e61ac9abdb18ae63337b57577c9f9 SHA-256: adda612ba67a5ec8c4ca755cdb11a153f3e5f7ca7a0cb5f5000bc00225bf2b71
164 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 malicious PDFs to execute code. It also contains numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://synerhu.ru/uplcv?utm_term=mlbb+skin+hack PDF link annotation
    • https://combrooncom.com/contents/files/70060371316.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613dda4186b0f---sibuzexikizegukivoxuz.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134e3c6f176b---15944820120.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/setuvazawidijexinuke.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161397ab7546e8---41194368622.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a845fa8f03---64302977766.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/50928064625.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/17928679645.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/kagibe.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/62716060094.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/kenojalefelaxiba.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/13868068804.pdfIn PDF document text
    • http://mobilenmr.com/files/files/remefawale.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/85144615878.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd8a949ba1---29263421512.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/75814644625.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613841b170d22---9645939447.pdfIn PDF document text
    • https://conrays.ru/f/data/58603404359.pdfIn PDF document text
    • http://anm-av.de/uploads/files/27577765202.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/53464607835.pdfIn PDF document text
    • https://drlanda.hu/user/file/85013255466.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/42270581472.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/71776976591.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/gubofavasijafi.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/35775542867.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_off00010fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCC 10104 bytes
SHA-256: 2bbc0ccd335a94c0cd87c528cf540107e15b63e34bdc54c39ad3f387ec4ad7f6
font_01_sfnt_off00012632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12632 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E44 19976 bytes
SHA-256: af4a5a1532230f2497aea8ce9eb25cb48db29db73503964322f987dbfef1a667

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