Malicious PDF — malware analysis report

Static analysis result for SHA-256 135e289d6a0a91a7…

MALICIOUS

PDF

84.2 KB Created: 2021-09-10 00:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 414d496aa08eb8d1dcbe9cbf0f94c7b4 SHA-1: d84f855cd2ce79cc4891f95516e8945939c02a0e SHA-256: 135e289d6a0a91a7fb3d879f89aad74c06da3fdd73c87e6d105b52c6e4dbb6c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to various external websites, some of which are hosted on compromised WordPress uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://laborke.ru/uplcv?utm_term=minecraft+java+edition+1.16+free+download+for+android PDF link annotation
    • http://ikkosushi.com/uploads/files/xivulijabaxojenosajava.pdfIn PDF document text
    • http://sjhtractor.com/d/files/71253840174.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/cc6287471b1915c67f1f58ea8f743f25/26955234042.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/nawabov.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/50575941852.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/80432478322.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/fveobgcuv4osa7t6kpr89fclgq/dirigedizipofaruxabapev.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/34499894447.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/serizawikevijavunuduj.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/rifiraxiwulaf.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/812967408.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/433519f1c508a6364dcd627bc5b21c3f/poxafesavotedu.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/80910464861.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/80683452349.pdfIn PDF document text
    • http://tcihk.com/userfiles/biborujelozareb.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/63419400928.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/94130775400.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/32543048040.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/xuwupijowajojaxoduvo.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/kinetejirodeginejedow.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/34175450906.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/6a88aa7ab266442fe84fd21cff63feba/soguzuwov.pdfIn PDF document text
    • http://retailcop.ca/files/95103407578.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/totupasavusa.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e09839f0f---mabesavupexotuk.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/21628182575.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_off0000e1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CA 10864 bytes
SHA-256: 165b457927963aec76a56e60f157f306635f91f9c46db6d47970ffe04b2f3035
font_01_sfnt_off0000fb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB14 18232 bytes
SHA-256: 2d63baa7774a183f8fe598194a8958a5a216c13781e275026404ec17d823523d
font_02_sfnt_off00012a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1