Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8c27b08694aafe…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 19:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 05894785bc9240c59c09f367b3fd6786 SHA-1: 5c7ff796eb40bec35b769bb5dcf0028642fa084f SHA-256: 3e8c27b08694aafe19444591b632bda732a6d7107fd32279ac8be239e9c541dc
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple disposable domains and potentially compromised WordPress uploads. The embedded URLs and the nature of the heuristics suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://bilafafafa.com/shopadmin/upload/files/mojomavenuperezi.pdf In PDF document text
    • http://stilistspb.online/public/files/uploads/files/kirag.pdfIn PDF document text
    • https://theurbanthinktank.com/files/vuraburanidavutitilulewu.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/gededudubegine.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/41044707434.pdfIn PDF document text
    • https://razredna-nastava.net/files/63185234920.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/kibugikedanezovadujese.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/buzodikilazogaxapikipen.pdfIn PDF document text
    • https://jetaime-shop.dvsportbg.com/files/90608480353.pdfIn PDF document text
    • https://digireg.es/upload/vasojajoxabematowifos.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/45557998390.pdfIn PDF document text
    • http://skncn.com/u/files/ropakuroxafoxagal.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/famokajorojugaxegubaj.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/94273061566.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/70994400893.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/telosimuzok.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9a5e5600e---52043180334.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109011258084738.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/vebale.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314aa6c9b7d---85237657093.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133187903adc---xanomezu.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/gefupolapov.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/45082082012.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161322d6482429---timaxafasanokikar.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/8143e311e7cd7f2406898925db942cdc/podivafaxasirulas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+get+mms+messages+on+androidPDF 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_off0000dcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC9 17708 bytes
SHA-256: 92af83bd1e53a6b32980698021b4740d9c8059f3309746fa243b23172f214513
font_01_sfnt_off00010a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A91 10620 bytes
SHA-256: c2ab48bc45b23ddb6949b4b83519766d76545b8108d4129cc2c91b16676ce470
font_02_sfnt_off000122ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1