Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51e3a64b3d5420d…

MALICIOUS

PDF

85.4 KB Created: 2021-09-08 07:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8305ebfd8e8e2a4109b27c65777ad2d3 SHA-1: b66214358cb7015a50e808ecca62e74b1fab4fe2 SHA-256: c51e3a64b3d5420d33fcea53d1041cec59238fa62ab42cccd066c8a0dee36bd3
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to websites hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and potentially for SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://shuimotongyuan.com/userfiles/file/44010244759.pdf In PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7481abd105c24801410456664c8340a3/69042036560.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba1488dc88---zojalenisaxodino.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/wimisewaruzaxefuroja.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/83260950987.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/b1d6ddba0cf3cca722b5519c16340b32/xoxujunapowokisazaf.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/77347874966.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb1a1a9a08---mebogokitopopalovu.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d79c4d0b99e---34263194477.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99270c00d---simovumi.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0b662d5d3---31060038705.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c540f458a40---damumusonezasudotafefaf.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16102c7779765f---womorejimapawagupupunisu.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108b1df51b60---wevetavox.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc258eb7ed---bamakerizuwosikaxelovox.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160961c31d8999---vaginavexo.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/fudep.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/xidugewasuniwo.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/futupiz.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/29816175519.pdfIn PDF document text
    • https://jin-ji.com/upload/files/98777888092.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/nogotelizimegutad.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/1a5dd295372b43f7be13bae43da812ae/73239628357.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630391429_a61c21c565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=panasonic+bread+maker+sd-bt51p+user%27s+manualPDF 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_off0000e608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE608 18000 bytes
SHA-256: 0c9b1dc6ef7f3f75f5ea8563e3188b210913693e475d93cbda2458e3cb9cad0f
font_01_sfnt_off00011504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11504 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1B 11260 bytes
SHA-256: 6592545611dfe8cf361f91561e9940a4e7b49c60a9d2bd93bfc1d42f64f603f9

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