Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e6d585a98250f1…

MALICIOUS

PDF

86.6 KB Created: 2021-07-21 12:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff82678051686d625fbadbd84c131f3e SHA-1: 2bfa4b5eb26aa41339f8b1c0afda026fc82f34ec SHA-256: d6e6d585a98250f1b720b0b11017263027ba3da0426024473d9f50a411de0e5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://bettaletroom.com/file_media/file_image/file/liten.pdf In PDF document text
    • http://zoldjogsi.hu/uploads/files/20221602034.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad78cdd6c8---koreruvamizagitewetiku.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/poluzapaxabop.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c71b69b0c---77581377486.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/1912382673.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/25d27df2ad33ec89997545a2b3cd84fe/3485148398.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/82532071178.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/c50e9398e75e1805a27c7f15c1bc1279/dibeza.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b16e558bf0---pazelikeluwarut.pdfIn PDF document text
    • http://misspacificus.com/clients/873634/File/99608495727.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/ekpsf022gr0se8h52csaieq387/71413017706.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/pekagarogin.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8833e52dc---49352640561.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/23648bbf84b3a08dbb90abe04f5aabc0/zobeninazilamij.pdfIn PDF document text
    • https://aneri12.eu/res/file/nejaxuguwe.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/73661476714.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/51342046859.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/ronupagulebujefutinu.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a98a6448753---xifijiv.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/4328423801.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/7899224963.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed4357a8e4---sufimegeki.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9e437208c---panal.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/73653123521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=excercises+for+latsPDF 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_off0000f0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D4 17248 bytes
SHA-256: 93d9e767389882ea93ca55e3be74f900302d935251989c2a6238ef5cfcb34bee
font_01_sfnt_off00011dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDA 10312 bytes
SHA-256: 3a713fc10124516baeaa81764b8ca836c7e49c633ffd4ac41c35ceb852299fce
font_02_sfnt_off00013547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13547 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1