Malicious PDF — malware analysis report

Static analysis result for SHA-256 907f6545adcff814…

MALICIOUS

PDF

81.9 KB Created: 2021-09-14 02:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c4e593e29e2726690bc0ba51d1e2ab29 SHA-1: db02e12ec776d12b0fb19b2411fe0dcb58e4f82f SHA-256: 907f6545adcff8148992c0b83cb72084fac8dc1ef747cae49f947f0fc939a0b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URI heuristics and the overall structure point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=imo+plus+premium+apk PDF link annotation
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1d2933e2081b31b60de793d13f0b8397/tefab.pdfIn PDF document text
    • http://vln.nl/files/file/xisabafaxijosafivulupigew.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/rovemamo.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/70m3rtbind30tgtsnqmicksjpi/vatuxazu.pdfIn PDF document text
    • http://garderoba.sk/images/_file/28069472271.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/vizavusanonuw.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/51d2cba93819f14a3e8eac02cae110ac/74696155135.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/92962520593.pdfIn PDF document text
    • http://aa-nusd.jp/jatakosetarele.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/f2e3a678ecdcf65aa6f1bc0c2c1fecc7/saras.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/vigakaxefo.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/tikakozebewub.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/nosuxolajemaxakategorij.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/wowigupebabelekiniponifo.pdfIn PDF document text
    • https://fond.ru/userfiles/file/jukew.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/9fb73bc0bb1f9e24d95cb76521f5156b/27888684585.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/logirefadolovezirov.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/gaponovanaru.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/96562165722.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/odqbtpf665nfn9rbp3mc77efm9/28200644407.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/1276209071.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-5/20210905000303177207.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/83788971822.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/99369488744.pdfIn PDF document text
    • 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_off0000dc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF436 18008 bytes
SHA-256: 7e6588487796930a835fc1ff41c0da8cc5a7d38b253d0ab983bdffc76f896ecb
font_02_sfnt_off0001229d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229D 10356 bytes
SHA-256: 0aea5f55b64da78c3ddcdcf7452cb5eaf2512dcf9005d625150211c1fbe2d247

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