Malicious PDF — malware analysis report

Static analysis result for SHA-256 852d46d97e88152d…

MALICIOUS

PDF

82.0 KB Created: 2021-09-24 07:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1df682ac14bb0bace558982dca215681 SHA-1: 61d8f3b0d59886d73f394329ca7d27a3cfe8e703 SHA-256: 852d46d97e88152d61c89a68e1a9b6d28e0694cb5ee0227e9323f61758e5a33d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ra7a7p-h3ba7.com/contents/files/72839600345.pdf In PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/5782938228.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/livotekijuzutanazipufi.pdfIn PDF document text
    • https://www.cygnusdvlp.in/nitdurgapur/uploads/editorUploads/userfiles/files/82542222348.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16141811dd07f3---dajubesugozotosu.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/xugijilajafofuruxakutaj.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6e5f2aa1c---42065275559.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/pavaxuxelimufufib.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/lalexitokutol.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/49477916416.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/33722388474.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147dc51796f5---xejadigenud.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/l79v6rgea6rf58nh4b8esvok3r/60501172904.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/16962316152.pdfIn PDF document text
    • http://www.bandungmesin.com/file/92685468671.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/zezezevosoretine.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/86529363060.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/80905344230.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/gisaranu.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/vijijimivolafenasovipeg.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614d15b24d44b---zojulemavoze.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/86311113066.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4d7eee596---fiwilesiforizosi.pdfIn PDF document text
    • http://sjccgy.com/userfiles/file/61569851355.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/ee901833a5278047845a3e34330639a2/61854059762.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/lajopegeroxoxekatexobak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=draw+army+gamePDF 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_off0000dd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53A 17924 bytes
SHA-256: 4c0e82b50536321235157811999ccc9b5b896762408b511562a37cb8c806e5f0
font_02_sfnt_off0001240e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240E 10024 bytes
SHA-256: 14e5433e4df7512e6d44c7f01315c97ea5c7e368dde6c8d19302804d17edee8e

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