Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c6a06063255e24…

MALICIOUS

PDF

83.3 KB Created: 2021-07-31 18:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6360b7a13052ed07eb8274f1b55a73e6 SHA-1: 48b48543b7068ecde26443272c4d5706b8a918c4 SHA-256: 87c6a06063255e24ba17a7d9312c491ff6b046448573a4893be6558bf4e22ea5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 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 http://fittbikese.hu/files/file/63153252684.pdf In PDF document text
    • https://everestart.com/images/stories/file/monifalijenuretufa.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/24259797972.pdfIn PDF document text
    • http://matthewsmillsreunion.com/clients/c/c7/c7863f7b93cb17915b2a89d887155530/File/naramawedonaz.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/85946650539.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/vexugumojuzoni.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/gifomafovekakekebatudid.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/qcsqb4g0fb4c5t2s8ebv3b4m4f/9038881824.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/ragajonopawumofuwalidabe.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/ceb6c4c8da19622fa8712243622e454b/30262035971.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/c1e620720f7157acbe29653098e71bbf/dotuvumibef.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/rowipejudode.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/mumagejopewedujexijiwijin.pdfIn PDF document text
    • https://priscar.com/documents/files/januten.pdfIn PDF document text
    • http://mysistermyfriendministries.org/clients/85776/File/semereligizazada.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/suboxijodefus.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825ebb54efb---85841554982.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/51174351986.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/2267208461.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/68608018206.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/nemumenaluzabibuzegejilaw.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/lowenasak.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/todirujemupunobonubat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=organic+chemistry+principles+and+mechanisms+solution+manual+pdf+freePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BB 16820 bytes
SHA-256: d03bc713009e0f297c9bbb9ae37e8aab2551d3f22003dcbc7af24a0bdeca9cc8
font_01_sfnt_off0000f4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBE 11304 bytes
SHA-256: b73132a70dae33d6a5eb8ea3b741ffa1c5d2b37d52b23c33b81eb66d4d1b4ff0
font_03_sfnt_off000126f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F6 16084 bytes
SHA-256: a79c9caf7d9fe7d7e6557dd08284a48a0650ee9668136fadcfdab94fba17ddb2

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