Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a87cf46dbb2977…

MALICIOUS

PDF

86.4 KB Created: 2021-09-19 07:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6165bfcfd37864625c812069b1c5b00f SHA-1: 251c005eea31b48b944c49a21b0a2f36a12eac03 SHA-256: b3a87cf46dbb2977b8bd4caa1446bb66ebe7d00d3c65ad3c1a293eb389f1c4e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crewmak.ru/uplcv?utm_term=play+time+apk PDF link annotation
    • http://nbnjl.com/userfiles/files/78706148052.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef794def26---56823057946.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/muwuvanojudugupi.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/56599537148.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/soboledu.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cda43f390d---327113403.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/pizuzinobew.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/nixibinaruwidi.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/62919294105.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613baab3b6fd9---70656836997.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/mejipinubewipabofu.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/10903334114.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/56301313454.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/23015169250.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/79470027334.pdfIn PDF document text
    • https://esvigo.com/upload/files/feforidikigerotifetizixew.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161304b7583fce---finakadevanaratawite.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613028cee83a8---71568307198.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/28206550564.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/guxukiwigasosumaviwi.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/rasaxetubodovaxagezasezo.pdfIn PDF document text
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/74974500695.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/43999433737.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/wuwevagivefamuwixiwube.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/1908621789.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/powotew.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_off0000ec4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10460 18876 bytes
SHA-256: 69c4ff1bc518ca2bf4eaed78d9ca9471883e1108a55d4f2101fef682fa04b050
font_02_sfnt_off00013559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13559 10128 bytes
SHA-256: b8469cab2312bc0c7406469986a906910598a78664d0cdcc0d671940cf7df730

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