Malicious PDF — malware analysis report

Static analysis result for SHA-256 a01490be635c53b7…

MALICIOUS

PDF

83.1 KB Created: 2021-09-05 20:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 63c2119b576a0c497f59da5d600b5718 SHA-1: be60349875fef3818cd67f433ef600dec26edaf6 SHA-256: a01490be635c53b763926b3e130bc626b317b107a9e67897a81b85f181002ad1
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of a 'download button' heuristic further supports the attack pattern of luring users to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd1650673a---bejafesipudevamizomazuf.pdf In PDF document text
    • http://babywagen24.de/userfiles/file/76558921030.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/47103039168.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/731080aa212f2e17faa2813b35a6cee8/daxafid.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/lofeluludo.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/1jmt33ks4uovrqb9jgvpve4obi/kuvopatomiligupade.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/059106eff65be2473bb9b6a5876e3ffe/26326267768.pdfIn PDF document text
    • http://beiks.info/public/file/8940426376.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/8146828929.pdfIn PDF document text
    • http://skincarebylaura.com/clients/862251/File/57310461132.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/xufanibi.pdfIn PDF document text
    • http://cichanski.com/Upload/file/muzobadisovuwumurubupu.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/xofilaw.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/menadufadupetujolekupopuj.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b252ee25967---fopenizeko.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/toxojamoxogatefuluxopupe.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/9d02fdece12d0126fd4a5d60e6e1707c/32323493938.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/ac8b6014c33c37f326e79ec42c355b9a/gaxunufin.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/dc4951a041ed39ff9583408b83ecd688/lixisinojijakagodivogani.pdfIn PDF document text
    • https://alutat.com/data/file/89830554963.pdfIn PDF document text
    • https://healthcareadvisorsgroup.com/wp-content/plugins/super-forms/uploads/php/files/n8fcdgvhk1udoe57vd6hqse8h0/3290835652.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2ad78a152cbeae58b2d5e45001d3332c/zujiz.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/lavokezisotasimegena.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607314d857bda---23552298697.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/5359a986a4928e26b7ce80f3c6af3f87/folataponako.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/57902853635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=istick+pico+manuale+italiano+pdfPDF 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_off0000ddf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF605 18624 bytes
SHA-256: 60f7fa079b58a52c497cbb8d71f1b5d27d9ab0adae01177d28d3004e3e35e430
font_02_sfnt_off000125b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B4 10824 bytes
SHA-256: 3f90ca0157e21735cca56f46a521cb01ff303ffcd54b3ffaa7156778dbd83a93