Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5d03dd6ab31277…

MALICIOUS

PDF

83.7 KB Created: 2021-09-10 05:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0aa109f7236de33c42e5fcfa2c009fb6 SHA-1: 9738efdbf8cf0e3806fbc61381ce54e97c65d164 SHA-256: fb5d03dd6ab31277431a4c7aaf384900c24133df2f262b236e9857ab3ef2a6da
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised. The primary purpose seems to be redirecting users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://pensjonatagat.pl/userfiles/file/39505444950.pdf In PDF document text
    • http://autosoftware.company/autoresponders_images/files/68040911212.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/duposorumew.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/66030636771.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/38565771643.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/4052897651.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/78641250362.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/safexodijesovuvabubemunut.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/e55f0eba0787596b15a35c3de0f47215/7594046999.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/36769988057.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/gejakinilaxalipane.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/db4fa238c5ac81f8ec06946d41adc045/89118563816.pdfIn PDF document text
    • https://gameclub.by/uploads/files/tisuw.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/xugetozifuxepixojizegizod.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/96221717050.pdfIn PDF document text
    • https://aitalk.vn/upload/files/17209141493.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/21238889610.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/resofigaf.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/fifafera.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/zokiwudivugubojevigija.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///vilomazibadutujazepajumif.pdfIn PDF document text
    • http://askort.pl/Upload/file/60443502791.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/3262134685.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/xuloxetexaxujefakafox.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/841584630.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/ramowujogibudefijinusi.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613113f510449---muxerepokorado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=66+unblocked+games+slopePDF 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_off0000e090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE090 18288 bytes
SHA-256: 921a090157ff1918c2ca7a34011f5af4b9e10ff88946f458203b19d54be093fb
font_01_sfnt_off00011020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11020 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12837 10968 bytes
SHA-256: 8eed220a63a50490d4dab32df705f124ec882c4f1d04c4e65c780cf1ac3e1c6e

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