Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4245cc711c83603…

MALICIOUS

PDF

96.2 KB Created: 2021-07-24 03:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 338b0ddb88f8de813225e86c522ec82a SHA-1: 0714ae823e1a32a45a4fce72e9b9ebab1a66f90d SHA-256: e4245cc711c83603fee5460657309c383605fc31f703f8327286f5d01c19c09d
156 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting domains, suggesting an attempt to lure users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters in some URLs indicate a coordinated effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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 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://cgeminfos.ma/upload/file/juvetutuvisatebotalo.pdf In PDF document text
    • https://koreayokogawa.com/ckfinder/userfiles/files/lasorazajesefemupeg.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/vexolomebiruzigipi.pdfIn PDF document text
    • http://martonelektro.hu/files/file/tesefali.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a882ab218aa---35702863938.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/torubikekikufato.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/42935940655.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a94e4961157---92098533230.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/9f25f879d1c5d19fdb2440fdf2a32c10/51106224412.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/atfqsnbuego3u8r8kf437j1flo/35903951999.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/14717630939.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/wolabedagokim.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160993c8132688---91394750340.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/9928692783.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/tolopitotakema.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b267269115---61827684946.pdfIn PDF document text
    • https://heyratacademy.ir/file/dotase.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/sokojenaw.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/91368869729.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608527aee3a06---bifebefimapugux.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/visarajuvavokig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+non+transformational+leadership+in+healthcarePDF 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_off00011261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11261 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A78 10880 bytes
SHA-256: b716de46b969df01e61da83a3dfd8864fefb9f31f05c9d9e48726748e16fb4af
font_02_sfnt_off00014369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14369 17944 bytes
SHA-256: 0362e8c7658a0ae65725d38c4a93d274eddd5f5c8f90c239579e6b6186971d56

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