Malicious PDF — malware analysis report

Static analysis result for SHA-256 092157bcbc2b591e…

MALICIOUS

PDF

92.4 KB Created: 2021-07-06 22:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9645ff5bbd1168c30990a2e219ebc507 SHA-1: c31b4a3453d8dcdcaf4cc40ba401a98ec78a1c95 SHA-256: 092157bcbc2b591e736d218eb33083bde9ac2215ffea98eff349f59e23eb3f5a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised websites, likely to distribute further malware or phishing content. The presence of multiple external URIs and link farm indicators suggests an attempt to lure users to malicious sites, aligning with a spearphishing attachment attack pattern.

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 http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/t0u449vhjj4ioql3hdcao2pfk6/voziwisofejelisexanagimom.pdf In PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/aa8f0562f51c0d21fda123ae30b60d48/xumoz.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a586ec2ce---33534141821.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c87db4cbaf9d0883646e3024243b0c6f/57064465015.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10d522cb09---fixegikoxakekuwarusilef.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/ll42hi2he5e7sbof9tdrr7kejk/gefuzebapofumevurapuwo.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/34091379275.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/gafamo.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/33207364453.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a294310c01d---jamutojafunukesitadob.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/98586015304.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/zixutalijefodoligize.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/29986201800.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/1d7f228f3b2ffe418be55ac3d4fdc415/monewerawimuronuforam.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0f89950a1f7a1d01fb12c0c2d0d59917/sodimizadomagorapixaw.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/putodi.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210602053008.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/gewerawexa.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47af2eac24---68060986437.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/86520509110.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/78905707246.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=japanese+stag+beetlePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 10248 bytes
SHA-256: 8ecc132dda00312f5541f9bfbb9f36cc4741f813d903f17cb9c97c819df50318
font_01_sfnt_off00010db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BF 4840 bytes
SHA-256: 9a77cb59a8cb9b33421e1a134f9d38a34c51ca5b9f8264fc4a1902e774ddffea
font_03_sfnt_off000137ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AC 17216 bytes
SHA-256: f1e9f16181fd0deb4b0d34334ebb98e21960d11edc6b75672f8244561482731e

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