Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fcae7161fcd26d…

MALICIOUS

PDF

77.2 KB Created: 2021-09-18 23:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9ad121d8245f9283955a94389cdc0ae4 SHA-1: 98a9bd90abafd3a6d096310fe099e469448eb3fb SHA-256: b3fcae7161fcd26dc936fcea91d9792dcb666299dc555c38781e118a92f342e2
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest an attempt to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://salon-urody-bellis.pl/images/file/65560029345.pdf In PDF document text
    • http://rollfactorytogo.com/uploads/files/14293665659.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/14783849332.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306f8b05ff8---74697073937.pdfIn PDF document text
    • http://lactopad.com/uploads/files/29325557802.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/rirakiradodifepavir.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16143329cc5546---jigivitetiguwezelusoparek.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/53333240451.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/dodakududizodorito.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/mukikizaxiwanadisilatuzu.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/30162591279.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/34086176541.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/saxegab.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/89697086114.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/kimemal.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/podibiwizasapixumawesi.pdfIn PDF document text
    • https://85097781.com/upload/files/litodikureropefabikujised.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/manubojejinivumareko.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/kenageseninugafis.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/vewed.pdfIn PDF document text
    • http://www.siposferenc.hu/html/42002070742.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/roxape.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383bf9e0ad2---pojidunuvov.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/35cd3cf0ee39f4a7a25a32ae601e83f5/lokunifimivepelupijekip.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_03_13_47_03_6097.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/44624070755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=poco+x3+nfc+romsPDF 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_off0000cdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE610 10244 bytes
SHA-256: 7d3727c0ed0e8a20ab19445c2bfe27d49d68ccd8bfb520e6185bb8a859c49ef5
font_02_sfnt_off0000fd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD16 16756 bytes
SHA-256: 129cc23e19b88214b4d4a9bd5821b8240c23c750dade7c50044d19ba05453175