Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ab31e3706e50ab…

MALICIOUS

PDF

77.0 KB Created: 2021-09-05 08:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 92375994c117842b2a0d3f10e140958b SHA-1: 4f70be7e5c94dd492ebe4150fe7198f21b24e030 SHA-256: f5ab31e3706e50ab658b9e1839f6bad394ef9b31a7fd7e4b06fa0291a91347cb
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext, aiming to trick users into visiting these sites. No scripts were extracted, but the presence of numerous embedded URLs and the link farm structure strongly suggest the document is designed to redirect users to malicious or compromised content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://gldbirdgel.com/user_img/files/24219469934.pdf In PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/309556a3cdc4ead06e4c1d8e9c3f53ea/88980305756.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c4881b2de---59806772852.pdfIn PDF document text
    • http://teplospectr.ru/images/files/xobiledobituzoboriranife.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/26613139831.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/7b5f038e065efb298f096604638bdb36/52423127589.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/635c805ec2fa185db95100f54edaa889/tigixatedaxuto.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608095c4e91b6---40171272231.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606edcd2063c6---kexawebaporajusizadi.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9ade67a2a---48136650361.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/kunedo.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/novabapuf.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/tshnpeaa5v56krb5h39ignjhv3/saronitenafifufiviziruv.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/24847032482.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/jikim.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/3954474406.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be6ee5aa3b---wazidajumomalefazugafova.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9760a2125d---1300973475.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/78d7bb9273dad191cf58392beb07ef92/794391102.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/58988648742.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1612bd9d798827---zebabuzojopujali.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/8502080102.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ra07j619uvug9q4f9u9b875d7q/wetegimevunubapimod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=manual+fiat+siena+elx+2004PDF 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_off0000c465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC465 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7C 10504 bytes
SHA-256: 854b60f40eb28e5c72b3fc4125bc3a4b04aa91618cc9b042ae8ecd5a1a763d96
font_02_sfnt_off0000f49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49B 18916 bytes
SHA-256: 98f71562ef3b8b16562b9e60b35c21c17d5c1bfee3bd1f5b3671656d8d06fb5b

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