Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7be09b2c43a216a…

MALICIOUS

PDF

135.6 KB Created: 2021-07-25 07:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 25f9899f9698495c532ac5be42b0fc11 SHA-1: 344a57df735d6233b43d3af2a128283a625dc9b1 SHA-256: c7be09b2c43a216af7b799f386813985711514cbd7f9670b8d35134d04bc0b7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9634

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 https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/079a5f71656519902508b83214250b15/42700815918.pdf In PDF document text
    • http://icltindia.in/userfiles/file/25149751839.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/mobuwaxudag.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3ae8c4aa2---fetunezesenidebokewewozuf.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/melofuwibijebutezejuvuda.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/bbc021e5d8ec74b93b6dbb8c326a1a99/77446238359.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/563921476.pdfIn PDF document text
    • http://gibisch.org/files/files/47818747006.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc94fc2977a---jukowopew.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cafcbea86---60166239990.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/5538554dbc29058c03d4582cb2c9008c/lisutevimugelufani.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/41426773922.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b342acad466---92604508886.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ec539d04856---linozul.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/segabisimoxolixeku.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cf24967ad---85862632974.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/c174d17fb419755bd24de62d424af9f9/zikesilomomozemirukolud.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/15762108984.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/nefigedomelufufigegivulel.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/97650624068.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c5fe025fc---15529688857.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/b62o31b9llfb3408vp3k7gqjqu/99653176778.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/wibojow.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/36488908480.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/84632bc179ebf29e3d29fa504862812a/92537170988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pokemon+game+for+java+mobilePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001879c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1879C 16172 bytes
SHA-256: 4d323bb249e88c398f0095f889563dfd8dc5db968c63eff0834307f32c320b32
font_01_sfnt_off00019d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D12 1936 bytes
SHA-256: 99a5c67c39fd88e7c0f98b2bd076d07bf2c0b6db3c6ea8fdf407754d2babd249
font_02_sfnt_off0001a603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001be15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE15 22340 bytes
SHA-256: d7edb3fd5dc1b338b11cda60f1417d93dace5b0002c8539e36415f7d85cd16ae
font_04_sfnt_off0001f470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F470 10720 bytes
SHA-256: 1be6e224df8d479d67ed8654ce01b0f67188c397c64cfbbdb9f56a97fe80cce8