Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0953e0228b864fa…

MALICIOUS

PDF

89.5 KB Created: 2021-09-07 18:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e7f5533040dd99b15e7eaa17a424c7b5 SHA-1: 3d4d1fab2dc84d5db22a04176c52a2b6819998f9 SHA-256: a0953e0228b864fa9c5df5ffc2ceeb17030f9d074729a21957917995310b1e36
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms, indicating a likely attempt to lure users to malicious sites. The document body is heavily obfuscated and unreadable, suggesting it's designed to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 https://istanajp2.com/contents//files/wakovozawuzujulokagikeluv.pdf In PDF document text
    • http://hadt.vn/upload/files/85408171047.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/voxopiwofubowomigeveto.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/zesabub.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f21216089a3ce3f003742a137b08991c/81375999973.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b7565474e---gevilanop.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609038fe93235---33183426935.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202108190120171866.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/1140r49bcbadm0psp5gjmgajos/78034423072.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/ba51915dfb7d7bc43e4799f9394fed7b/44024215596.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99e3f266e8---31600412067.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/22708158806.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/d5207daf0584c5aa7d052e40ec2f504e/79727976487.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/9f78e8a6b8699a353ff367d00e3ce2f1/sozumovogezuvuri.pdfIn PDF document text
    • http://citra.cl/userfiles/file/26506141475.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/38217226096.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/7l1smd4q8t08lkadpu1dqd18t5/bomivejuwoseziwagakabuze.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096702f22eb1---45759932277.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/86508142775.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/46165510460.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/77c7c1492a394a870562c5a4f38ba6a7/4246584081.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/28871933574.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607577ad9bd6e---vovuwagofikijuren.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609436c5a0db2---46799000252.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/muxofof.pdfIn PDF document text
    • https://qqhanoman.com/contents/files/49070508078.pdfIn PDF document text
    • https://irantruck.ir/data/file/23383954235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+ten+ox+herding+pictures+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_off0000f333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B45 20552 bytes
SHA-256: 2575dc363e44b7f35362b683dc3e9a1a7370072ed4156486f0185b7a58e648fe
font_02_sfnt_off00013fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD2 10856 bytes
SHA-256: 1a5372184fea3502daa7189f86d79d495fc0f42b17f73483dc3e015f76a5ff24

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