Malicious PDF — malware analysis report

Static analysis result for SHA-256 c41b2e270a0817eb…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 07:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6ea62b9cc7afeee3b1bedf1085459fc4 SHA-1: 5948e9198bcab5fd1c43d205808c6fc0d52f9144 SHA-256: c41b2e270a0817ebd5fb0967c1e45ef469cdb0a0df192943d0ef00026c5dda26
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 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.
  • 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://irlanc.ru/uplcv?utm_term=carti+apicultura+pdf+gratis PDF link annotation
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/44577998239.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/79895297322.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/vivazolamirorepozurezo.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096b2899badd---lavazumugoxefo.pdfIn PDF document text
    • http://mariancozma.com/_user/file/21478954023.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607060619f680---lanebanuwoxaxabigekifus.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/7bc2b385c01c89837cf925e30482a0ab/kedomowomutafukuvegav.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/27564468436.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160780cff7f4bf---76286997779.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b74e3047ac5---92992111704.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/25395088188.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/duzukukutidezinotolav.pdfIn PDF document text
    • http://daikinhbac.com/upload/files/tufodoborirup.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acd90a94d74---47768899472.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/89372099852.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/vavug.pdfIn PDF document text
    • https://beaszemin.com/files/87161350716.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/72722411534.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/8d96d66e329621c08480d37dc2cc1525/zejojitikoxiko.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d383e4150b---53997940401.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/solusojudadule.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/43993262967.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/3da20c3d38c9ff1c1405b4910ff917f4/14070804593.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/kiwagoz.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_off0000db1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1B 16728 bytes
SHA-256: 1708f25b307e960dd163763d0e19e4ed633e98bc07b1bc896b1ba65524e5e9ca
font_01_sfnt_off000104fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D14 10568 bytes
SHA-256: 85a1c592eeaea40a6ab1e67c855bf714df31fda04cb96e93406f8c4aa616a47b

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