Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca91608f02546640…

MALICIOUS

PDF

72.2 KB Created: 2021-09-26 19:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d0d99cbac344d4f8d9a1dae38bd94fab SHA-1: b2ea2a2e35f46f1ab550793722b7835e994b6c28 SHA-256: ca91608f02546640496389fa91961ec282f7ad830ea987167eb95ee7e885632f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised or disposable hosting. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement, common in phishing or scam campaigns. No scripts were extracted, but the structure and URL distribution strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=how+to+save+a+pdf+on+android PDF link annotation
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614093a9b1e60---puzofedo.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/98131980318.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/dakor.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/63579689161.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dbc5c21036---2158007478.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/47776414259.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/mipuferuwipevijow.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/c3eca2121fc5459a97f5389886df65f7/79220787745.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/23886666440.pdfIn PDF document text
    • https://majubesar.org/contents/files/forivedajufutapelatagawu.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/81008351474.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/vifox.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/lazeverobopoxowoju.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e8d101889---92509955544.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/62884269495.pdfIn PDF document text
    • https://atiksigorta.com/files/mowonobebosuxelov.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__61483F6F239E6.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/avbc8qt7o8a4b4b7cv0s8dneb5/puvanisajuxovumi.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/26116487460.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/kafakexanosanafel.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/venibupukebizubewisagu.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/9903079834.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/18902927864.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/befutulonosepi.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_off0000b5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE00 17484 bytes
SHA-256: 94139e2d9313b55abe9193ef06dbe6ba0f1176b982d203197ddaf871b59a65cf
font_02_sfnt_off0000fb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB09 10588 bytes
SHA-256: 301710e61789351270bec2b35a33fac9734397e4dc44650b2922bbff65bf6b8f

Open this report in the interactive analyzer, or submit your own file for analysis.