Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1768c5eb1fa043…

MALICIOUS

PDF

84.6 KB Created: 2021-09-17 11:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de5eb641af6dae67983e2aad5cc1dedb SHA-1: 9c4c45ef34641570e0a7939f02e224a2cb925ce2 SHA-256: ab1768c5eb1fa0439ea6caaf0175c4a278f695c6edd490c49b1c3ed33524724e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting, indicating a phishing or malware distribution attempt. The heuristic 'SE_URGENCY_LURE' suggests the document content attempts to create a false sense of urgency to prompt user interaction. Although no scripts were extracted, the presence of numerous external links and the ML classifier's high confidence score support a malicious classification.

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.kickcommerce.com/userfiles/file/pizubimojagivumu.pdf In PDF document text
    • http://www.polni.si/Images/files/navomubipesoduro.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/8062351478.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///maxekegirowi.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/bc152321a1355d7911e52daaa0a925f7/33255939617.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/78fa2ad49c4b082e1904b998b7eb697d/44491506270.pdfIn PDF document text
    • http://b2cexpressdemo.com/userfiles/file/70835902447.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/1972023947.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/19014823734.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/batufuwasatov.pdfIn PDF document text
    • http://kammed.com/userfiles/file/fefexibepadogir.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/a2846abbafc34098e9ec37992d4c6593/fugajofilojirik.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/topeliweliwa.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/mojakatepejokijaj.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/wupatamesexejekemut.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/weteme.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613852735c6c5---kevulefadilepav.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/bekalekuzemupozagozisav.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/51463204544.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/xigivanifipegevusi.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/95679381586.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/9481261714.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210909075121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=stream+movies+free+iphonePDF 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_off0000e3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A8 18656 bytes
SHA-256: 4fa60d8593ac346edcd6fda39439467292866e719391931cb93ecb44324cd8f1
font_01_sfnt_off0001146f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146F 10720 bytes
SHA-256: 9d089d37ec7a2f156263957a688b09aa289974eb9856016dd2e1236c2d67ebca
font_02_sfnt_off00012ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1