Malicious PDF — malware analysis report

Static analysis result for SHA-256 053f1526788d78cd…

MALICIOUS

PDF

69.4 KB Created: 2021-10-04 11:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4fa70cb31e3137e6228ecc9b24602175 SHA-1: 81235e3e5eaee95f4a9c894bfd45a05cb180cec1 SHA-256: 053f1526788d78cd66490cc0e57a1e1db3d37b41a41134ae3a1c00e8a73deb29
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple compromised CMS upload locations and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, do not appear to contain executable content directly, but rather serve as lures to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://doosradashak.in/ci/userfiles/files/80978844947.pdf In PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16140e12f4be9f---vakapizivisuvanuxivid.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/zuragesamivi.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130900b0e0a6---wusuzusibavosimefubir.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109190705304880.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/a2ef6b2cfc2659977acac80ae048e0ef/83989841770.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/sesowabamotetefevonuvej.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6f086df07---ponozununota.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210909031212.pdfIn PDF document text
    • https://sokole-tps.pl/userfiles/file/91626524436.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/zifupiperabetosi.pdfIn PDF document text
    • https://botroul.be/uploads/48207366390.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/32498846345.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/33681804932.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/zubexamage.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/wevijozenonomi.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/5vdor3rfmu3sdahr63dc9gnoe5/73283450947.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210910175847_1367301386.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/vodozo.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd9ffcace2---pepajotarimejifu.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/2fafd4c3f3f8c25ca869ae9498e2a96d/nateduxodujebofaxugano.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/acf616de8764cc10b264aeb654083f7a/18761480967.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/lekevebeporusazin.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/451171824.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/3256098029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=lucky+patcher+for+score+heroPDF 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_off0000b175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB175 10600 bytes
SHA-256: 01ed72860393995bba4d8b5fa326e7b51bb199c254cdee1e1bf2c2bf8085ca17
font_01_sfnt_off0000c9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F1 14576 bytes
SHA-256: 6aa1cf15576fb3ca8292809513d2de1475fcf05da8f4057c7f353067cf2766aa
font_02_sfnt_off0000ee8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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