Malicious PDF — malware analysis report

Static analysis result for SHA-256 b985801c050d488a…

MALICIOUS

PDF

84.6 KB Created: 2021-06-29 04:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a97421b200c4af0c39e8aaf6e36a2d76 SHA-1: 75beb7f724eafb89133fc6edbe8cfb6bc244f1f4 SHA-256: b985801c050d488aceaada1800e1e7011ba5479c1bae08c7da8aae50899d1a12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of numerous URLs on compromised CMS uploads and disposable hosting points to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://appfacile.it/file/mifomaxusuxisuledewegu.pdf In PDF document text
    • http://doktor-okonski.pl/uploadimg/file/68152208455.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d626ab0d473---93768041263.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/16lh6g8m0dh2httvusmktjigb2/nulojodosafexibizot.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16073f07f0e737---kerigenisonosisusaf.pdfIn PDF document text
    • https://hostmegasoft.com/calisma2/files/uploads/wifosetirokewadud.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5e7d96768---nazuvepitizebupugekadaziw.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7c9a2ae6d---33225124743.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/julededagajozovumepu.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb0fc7ccd4---56900647805.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/a948dcf110ea6073a0474236fb53f1aa/67590535127.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b16692943---xesezozesamul.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160937c98b68f4---defifako.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b12371a009e44df86db65808bf8b9f12/bikitagutukulewedabeb.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/jesaseguv.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021062016261673499.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607af6747e319---zemikopovanoniporijot.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/pogupabolokomeguwapituni.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/juvudesorulog.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ae5cec88bebc765f05452afabc1e377e/35134406451.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/31881347620.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091efd12e30e---gaxewa.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/a78a0b1a739b1d69b2fdb2a4a0045153/wujenegugasa.pdfIn PDF document text
    • https://pcstaiwan.com/ckfinder/userfiles/files/vimexudatesubogituxis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=lord+of+the+rings+shadow+warPDF 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_off0000e3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB9 10632 bytes
SHA-256: bc73ba413c84c427ad39bd7b4d9a2111e8022abcf1ff0a40bb57e14a9c5a78aa
font_02_sfnt_off000113d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D5 19040 bytes
SHA-256: 450d647449dbb358dd0aa407082b6fbc5599269c220cb5687d4f2054258ed8c3