Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eac7e3d26d991e2…

MALICIOUS

PDF

88.4 KB Created: 2021-08-01 13:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c2d0624f2506307e0256fc2ad8e791a5 SHA-1: 63597470db2d6d766fa121fb9ba43ac958595a79 SHA-256: 8eac7e3d26d991e2f9454ac60a73514ca95565b0f4e5c56c475184c7712ce881
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised CMS uploads and disposable hosting. The PDF document body is heavily obfuscated and unreadable, suggesting it's designed to obscure its true purpose, which is likely to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://taiwan-casters.com/userfiles/file/rededepuxofizesazi.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/8qrufhc46ocuq9kstkjk4j2k44/26487225723.pdfIn PDF document text
    • http://furniture83.com/upload/files/57354371435.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f86900fe0---81536207391.pdfIn PDF document text
    • https://europartner2.pl/uploads/jajoxuzeduwafelim.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/nupqfek9h2l1vpsrst9p6kitqe/bunilezurezo.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/gdnf6os3osggpm67aqg9sag0mf/vizekule.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/5a7fb45da05d59016d366d1489e7f713/59607994995.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/femogunuketirirakuj.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160abdcdedf80b---93106334720.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/21937120994.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0392bd0f---zudik.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/welade.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/9c284e43217093fbe1de0e0416026b78/sijox.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/77633307012.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/b2702e73c9cae308d915e1eea317dfbd/zobuxulixoxopa.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/rr1bjd89id3sfuo35fokutrv7m/10600597086.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/d341b4abaa0b36cd49395a45a027cf69/77147223477.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/80458039063.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861ad5e7a8f---71014091892.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/l4t7f2mrg2rcob4cvqo2umc2jk/vapavugo.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/fenaberox.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/8cfea7a4ad9d15403d0c560cb0663838/vafaxolijelejujot.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac05ee0301---luvok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=bastien+vives+pdf+gratuitPDF 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_off0000f1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DD 18964 bytes
SHA-256: 1bbde720a6ec1e82c399676b80b00bafc30562ce009145a29e6bd7738ebf4a34
font_01_sfnt_off00012108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12108 10728 bytes
SHA-256: 2d215c3058c14f27873b240fe4ed6542dc8aee242f382e9f0ac617e254cc2e81
font_02_sfnt_off000139a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1