Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb627deb9fe1b26…

MALICIOUS

PDF

100.3 KB Created: 2021-07-17 14:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b372f213b1bb227aae3759674fbf1a97 SHA-1: 0ef5737f6fae0c39bc3f41e001e36cfdaf2471a1 SHA-256: 5bb627deb9fe1b26f0d62e83e2d1733a78843a58f0cb04e1bf932f59d784232e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many of which point to other PDF files hosted on compromised websites or disposable domains. This behavior is indicative of a link farm used for SEO poisoning or to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://georgekoldun.com/var/upload/file/tirawimuganubujabo.pdf In PDF document text
    • http://yds-wcv.jp/free_images/files/fixowetibiwilu.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/34618071306.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/43186851262.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781a039c874---35074039315.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/0879d9ccfddca819e9ae2f301dbbd52e/lakunizajubirarixesidekep.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5803926bb---kisosesepuxotod.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/28rp66bra3ca4rdkidgohebs95/83554633652.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/87192339374.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/84816693285.pdfIn PDF document text
    • http://clubchic.lv/c/i/files/sisaduximifovoxizakisi.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//lunapil.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ir0o36kr5ss42gopg5b74i24sn/35181392861.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/41522544558.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16093a3d8b00d6---fewikejilivezozokasarexa.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b053526a92f3fef35c64b341604d5bc0/90306598396.pdfIn PDF document text
    • https://senhewood.com/d/files/losimumumetozododexubab.pdfIn PDF document text
    • http://roocenter.ru/upload/file/xajusujul.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/wawobaritirijumogak.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/1l9dmg3ak1cv3im65b66bjlo4n/jujeka.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/nukagevigujosalurudilex.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/2d68c57abc6f5aacab3b95bc963a7ae1/denadipejijuxuxogosedelat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=boys+over+flowers+yi+jeongPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A7 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_01_sfnt_off000116a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A9 3668 bytes
SHA-256: d14fcef7d9dc1a966e8b2c63eade1ca4f45c25832548aa2480a007f7dcc207f4
font_02_sfnt_off00012534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12534 17400 bytes
SHA-256: 6724041d09f73214919e2bb26c5f5ccdb503ff8920a5348de223609f5c14d50e
font_03_sfnt_off00015294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15294 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00016aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AAB 10580 bytes
SHA-256: d78ea757bce11cadfe398a771a83dbcc7d15a6556833da9de6d8eb16a3f64571

Open this report in the interactive analyzer, or submit your own file for analysis.