Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a3e9e1b6b25dff…

MALICIOUS

PDF

76.7 KB Created: 2021-10-01 01:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 78c2151c3a0a509531c28e4ab32881fa SHA-1: f7c4512e286586313475241778d11b55fb3edfc3 SHA-256: 88a3e9e1b6b25dff275944a451ace12839ef0cab4dfe7e1acd76ae89a36569f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users. The presence of a URL with 'forgot+my+lock+screen+pattern' in the query parameters indicates a potential lure for credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://futurefacesnyc.com/uploads/file/meminekanabajisuze.pdf In PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/45082679672.pdfIn PDF document text
    • http://hingliltd.com/userfiles/3158079908.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/gutemaxiseradavifofuwag.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/56082630324.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a017f24c5---17575648000.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/3c404df43297dad49fe0bc7c2b1a3a92/xijexekikesob.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/pufumofonurekagofevezufef.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/kudetib.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/7958860742.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/15879989586.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/pojolatutiderumo.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/detetu.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/fazunimiwikaze.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148bfe63b685---geposibijikoxekime.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/97799116489.pdfIn PDF document text
    • https://partnermind.cz/images/files/tofubitofokudigifuxudewu.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/sefuv.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/folulewomuxoxuzok.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613505d8c9a17---98053677054.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/goramet.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210908125933.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/zovusorekirorulotezurarov.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/jijulen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=forgot+my+lock+screen+patternPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F2 17000 bytes
SHA-256: a3b42560ab5485a320e140c5a024a731c20a3c669ee45da31d3303a97a9ff515
font_01_sfnt_off0000de07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE07 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_02_sfnt_off0000f3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E1 10808 bytes
SHA-256: 0e1fa0290716964d975a6073b26f430ae1467245eb442ced395dd85208599270
font_03_sfnt_off00010ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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