Malicious PDF — malware analysis report

Static analysis result for SHA-256 93174f6d0584ab40…

MALICIOUS

PDF

71.6 KB Created: 2021-08-28 08:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3adcb056a7d0b74545e0ef776678e3b6 SHA-1: bd2d89b7ed66e7a19db9ba7ca306f7ebac620589 SHA-256: 93174f6d0584ab40c3b9ca3e4e259469f41fbf1965878d35ba02c0895026240a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads, with many distinct hosts. The embedded URLs suggest a tactic to manipulate search engine rankings or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c2df6888f4b---50832525278.pdf In PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20210820192235.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/vigituzasebenumuveto.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7360f85667---kaguzuriwutiritadixes.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/d35fd3095d752a7d0005b9ea527c8881/lufinobizal.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/50850307816.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/dd2175a47afeb828317823f59341fe26/91105706736.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/qrupl6b9mgq4n37br12caqddvu/togaz.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/9e17418afbda8c4855703d98c58d50c4/tivek.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/21908560430.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/kizidijoxixuwarem.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/7614253969.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/bawoseturu.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/80848216152.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/zaziroxuvowuxewod.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/95917681288.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40c49f261c---dobusetulisezonogugapow.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/zedokinudorogeruve.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777f5ad71c2---sumoxuni.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/38369544283.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/55123270337.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/62542545678.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=write+off+car+purchase+for+businessPDF 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_off0000bb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB31 10764 bytes
SHA-256: d899a44093c22a70fc667369f2c072b6dba4b1d88e030b2008caed28590a5ffe
font_01_sfnt_off0000d3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC5 14288 bytes
SHA-256: 0edd4b1a792e7b8aeb84f668197571d24878caaf1cbb9a9c808fbc936537a4e8