Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be8cdcb49ee36d7…

MALICIOUS

PDF

72.7 KB Created: 2021-09-16 17:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2a362ae4f8457325a288e5dd0f325e76 SHA-1: 2d4036e652395493b5a3b413a4fac70c7c1968fb SHA-256: 4be8cdcb49ee36d71a20841850a0fcc35cb952e0e00c35f01129c262032d9032
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://garglob.ru/uplcv?utm_term=is+an+android+better+than+an+iphone PDF link annotation
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/buturisexekilumijavites.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/vokufefidesijipalabuzo.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/gopujerizet.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/lazedifaxorulib.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/nuwarugalolazuvekuwudeki.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/jasub.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/tobet.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/92087300672.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091006092554.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161360b4596a8a---pusuwut.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/79093866055.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/xikuxotopuzopumujirinu.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/rabag.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/78127963750.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/94823436332.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/70000335118.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b541ef32b---7896599363.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/v5pv7tom2rqb8p9igops49nfaf/tisobigexofibo.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/vepisosajazuzomugelolim.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb4cf967f1---64045206236.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/jodewawewasukibafo.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/49514081494.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/tisijapufeso.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_off0000bb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB22 16600 bytes
SHA-256: 507291355fe87c0a5e2dff4aac584a2c0881dca492d2c43e59cc3d263c08f25d
font_01_sfnt_off0000e511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE511 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD28 10532 bytes
SHA-256: 973041f8337d56a07395eaa64bd01fd63ba4a60f38346876afc42df261b20bc1

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