Malicious PDF — malware analysis report

Static analysis result for SHA-256 36cb9d892104ebf2…

MALICIOUS

PDF

67.9 KB Created: 2021-09-14 11:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2731f62fbdbfc83f582f2dad30b19796 SHA-1: f3df3c0eaf67cb653f4c6f3f22102c2df6d617bb SHA-256: 36cb9d892104ebf243f5102953f39028e832181273f85f89601417539e3ebac6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous embedded links pointing to various websites, many of which appear to be compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The heuristic PDF_IMAGE_LURE indicates the document likely uses an image to deceive users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://polaryachtmanufactory.com/res/wysiwyg/file/7506386827.pdf In PDF document text
    • http://dienmaythanglong.org/uploads/files/vofunumadob.pdfIn PDF document text
    • http://artio.pl/files/files/bawipasimafubuna.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/40091298930.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16134872ed59f7---pobulex.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/molazufupow.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc9be6116b---17512337124.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/62372915432.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/jatagodakavubipir.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/7f7ce659aa430c096e2d37b6d0f2f119/monepizasimagisu.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/nabazexuvodiduvew.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/nelopemowupitimonitifag.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d2612dcb2---6392676241.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/lazirulapavupipowonofa.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16137623bc3b5f---kebuwapenalonu.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/jokoxeradijoxaxad.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/mufujagorujo.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/tuvazajirufid.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614004c30efb6---39420811256.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/mazirurulen.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac36a6513c---gupoxosagano.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/xobogikigugowus.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/xugepesafuxepusano.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/92927615383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=angle+in+degrees+to+radiansPDF 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_off0000b03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03F 10404 bytes
SHA-256: cabb3658916f1a721fe11735140237b7b4219b96d112f8930b089cecf41f4bda
font_01_sfnt_off0000c7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B8 14056 bytes
SHA-256: 1fef6ae35e870efdd791f51db4001986ac26a2c3f0e7cb7bf07ecce5ebc1e505
font_02_sfnt_off0000ea57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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