Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c944e52aac6ae9…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 11:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f959ab60cde9bb29ddf66cbd768be52e SHA-1: 9d7985a34a9ddb7f7b764a10c0c70c2e85401e5e SHA-256: 19c944e52aac6ae96a4e0c7d4a93b4fde56ad26c4798604aa420d4c53270812c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting sites. These links likely lead to phishing pages or further malware downloads, serving as a distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://eltdb.com/UserFiles/files/gomesomobozajobu.pdf In PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9da16cf32---rumufanifubudizezexalele.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba39564c77e---79437168792.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/7aa4e25a2c96a8da024adc50c9b2b4db/tujiziwudetaxebowugoze.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f076da33d3e---69324602434.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/zosumogosajide.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/fb0ff8766881f138d03292d76b848014/49500108041.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/146ps6c9dtreh6io72qcdsaver/tozusimufiwojazetitofenax.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3c95b6087---33626010687.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/jurokozafavupos.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/lufomudadolulirebiragi.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/wizexijejemup.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/48906406886.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/48029596279.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210723161957_eGV3aXRhcmVkaXZ1.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/jutojokijomexolivag.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/fffad099164edb45e3c337f13187f4e6/69854721409.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/36719616652.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/62884759337.pdfIn PDF document text
    • https://morabia.fi/images/file/dafaxejifopaferobe.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/7da2c6dd574d47ab775d3d9e873c5660/balip.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9c6091f01---81767937036.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/77501093585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=import+substitution+industrialization+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_off0000db73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB73 10780 bytes
SHA-256: 5fb99f5a5c46726a02b9ecb20684644a535d98c2e6163d9e138e1e75f0d15780
font_01_sfnt_off0000f400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C12 18244 bytes
SHA-256: fde4239590aaa51d2c80c12d0c691b3d1fcdfe23b32489f77bddbfa4548f1a8b

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