Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa81fb8b8a0bcbc0…

MALICIOUS

PDF

73.9 KB Created: 2021-09-03 04:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f6ba6c3be35973ca5b467edcd63d0509 SHA-1: 97836bf4427ce29f0d25436b9d7b72eef9f29dbd SHA-256: aa81fb8b8a0bcbc05d040de01b8a127691bac1e786d344b550b896a3f5338de2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal that the document functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms. This suggests a phishing or redirection attack aimed at leading users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/acd7b68bb8625e2b2198c01091f1a01b/95880993415.pdf In PDF document text
    • http://sxhk365.com/uploads/file///wiziro.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/gevesubiwerorodu.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/bhjbib76p4od1u3fcemppdln8k/safesirikawerakadirikunex.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/tevidisabuzedemanulige.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/xakipujizokufakol.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/61192395567.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/f5ekno4iflgt429r9olv68emh3/lipani.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/93701d60ffad9d1ecb65dfc74c0c9f61/60168134396.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/62pdsu5k8n2066ssd2op4ethjf/tewuse.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e843b7d42---89416550347.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/xusebuwol.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3aba046fed---91525261304.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b760804f6e5---15870008692.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707cf841690---dojizejiwir.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/nojedaruzazemamabat.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/ftdnofq7bcobcc4vlk84i15mff/bemorotimisunitex.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/aa03d3d90eb5a9b59f1c09babe59a9f9/siduwezoborirowopunabevov.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/velametofelukeliwo.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/mufimetonu.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/56304846897.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210725113403_p99x94.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/74012430291.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/79456973261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=14+august+independence+day+pakistan+speech+in+english+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_off0000bd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD54 16640 bytes
SHA-256: 297480c84811f42c179c22f64aa12a6a21ac6d82a9720bd66c42c7b27697752d
font_01_sfnt_off0000e878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE878 11020 bytes
SHA-256: 96e20479c6a0c4dfdd9b204ce8470128002d10c5939a602192145a46a5d6055f
font_02_sfnt_off000101db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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