Malicious PDF — malware analysis report

Static analysis result for SHA-256 2271c7aa2cbbfe11…

MALICIOUS

PDF

88.4 KB Created: 2021-07-26 20:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e57d28ae921e85b54d0716b17efad595 SHA-1: 1948505f05b50afb3f19dd9321fe793f461af0db SHA-256: 2271c7aa2cbbfe1123be3cf7b1ec5cefbe406b28ed8501f923700e5f5e72c3cc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs likely serve as redirects to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cde9dc2520---5198977764.pdf In PDF document text
    • http://pho32shabu.com/uploads/files/11126392993.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/2ddbb85d08be1e6973329f8598cdf5de/puwesuga.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099206b3fa73---gogelosikib.pdfIn PDF document text
    • https://noddy.nu/images/file/24672879.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/62157644794.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/95eqke4r2fansfbnj4qt3qtapd/33942129859.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/1347597726.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/vagonixizomijeziza.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/86139142555.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fcae3a46b---ginurinepis.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607124536462f---wenisofi.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/58758013498.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5bee192f22---33697668347.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/60479929521.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/51706158620.pdfIn PDF document text
    • https://altbuket.ru/files/49543631811.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/88333092425.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/govazapudunumalegonisirin.pdfIn PDF document text
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/73191375379.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/7d8199b22d13b75689b413737bd1b013/7838454627.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/zoxov.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ad8a9a340---sapira.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/47871030440.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/k8ualunah5plsp5tu7o39u3ps7/lovegerapubevodomalanapi.pdfIn PDF document text
    • https://pindimana.in/uploads/file/17393935712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=political+science+ba+1st+year+notes+in+hindi+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_off0000f3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC5 11024 bytes
SHA-256: 7cbfabe7a782aab3553af8e4e37e3b3810d25bbacdafdc70de0866b8ec313d86
font_02_sfnt_off0001252e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252E 17284 bytes
SHA-256: 68ee93bc92537447686dd610d06ad4f4193101488a6ba9af5827980e723a4f8c