Malicious PDF — malware analysis report

Static analysis result for SHA-256 49cd28341a19f0d7…

MALICIOUS

PDF

85.9 KB Created: 2021-07-04 09:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7173cea7572de3ee2a01da4b76e8baad SHA-1: 40eb51ea33e4b5e2d8c9b7310a8e35644e8164f8 SHA-256: 49cd28341a19f0d7523630ef6ec91feff83f00c9da25384f7158cb17ab6dfdc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as containing a link farm and potentially malicious content, with a high ML score and ClamAV detection. The numerous external URLs, many hosted on compromised or disposable domains, indicate a likely phishing or malicious redirection attempt. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://t-p-fortune.com/userfiles/file/xewonegipabi.pdf In PDF document text
    • http://andrelandberg.com/userfiles/file/48084187608.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/772ac06673159de77578e5ede82212c4/lemogolibag.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/45741889688.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/683ffdf1c26da64033d61ed85cdc9d01/80220413994.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/8415ae8f662f5c782eaeaec0cad12264/42977699325.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086144876f85---zotibu.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/59783894046.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cafd4aafc66---fuzud.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/wogekozi.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/jnev9fc9ds0siklk3tqm21p0ld/fuberenemijebenozelisedu.pdfIn PDF document text
    • http://esistore.be/userfiles/file/80503246651.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/20158873197.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b600ccb4bd1---wosejejipo.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/vodebumasijuwitik.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d73472cf66e080cb48e978007a9c12b9/nabaxi.pdfIn PDF document text
    • http://thecobbfr.com/clients/4/43/4363d5a08aa72aedcf7f7d4dd0675897/File/tokafikininefugika.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/zuwogapenigurapipibir.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/79od58jesupq5bs7ob169kfo60/juwoxato.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/topada.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/13328a02fe926011dae172f5a167ccee/siwujutapapuxukewojepo.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/kadimuwisiwezuton.pdfIn PDF document text
    • https://webmenuplus.com/images/file/ledilane.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/56392087818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=be+crushed+by+a+speeding+wall+codes+march+2020PDF 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_off0000eaa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B8 11596 bytes
SHA-256: 1ae3ee80ea66ee437d658fdba7134dcc56502b01442afa107e9a09f5170cbfde
font_02_sfnt_off00011db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB9 16868 bytes
SHA-256: 1600f33ff64a1d5ec3faf7f562c76e7f00b2e23c5858069e32c99df2406ffd7c