Malicious PDF — malware analysis report

Static analysis result for SHA-256 846c697fc29f51ea…

MALICIOUS

PDF

81.9 KB Created: 2021-10-12 13:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: de6beba7c8d90e844efb2de4dc13334f SHA-1: 216dd6bd022369d1f9645e4e884edb8bed7eaef3 SHA-256: 846c697fc29f51eab5af6893956e8108c258c20ce4c3579d2c6a3f5a789916ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to external PDF files hosted on compromised websites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues about its specific intent beyond the URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nurea.se/currency/userfiles/file/xusiruzovope.pdf In PDF document text
    • https://lalicorne-hotel.com/userfiles/file/19240268090.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/zadunabajobifevaroniru.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/gunewadi.pdfIn PDF document text
    • http://jfe.hk/userfiles/nimadov.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/93929473408.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/c7297f54f34d3927751c16d1195c0f17/parasibukaju.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e129501c0a---zujarezililobowimamanef.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/xenebawoda.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615443bc5fb18---98753681923.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/91824458824.pdfIn PDF document text
    • https://apapunada.com/contents/files/mamufefez.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/t1q6j0bt3i0ulsd7bbqe11tr66/82277770564.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/botovixobamokal.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210917_052713_8819.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/43716323320.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/87684399328.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/zakufomipezesusujusagave.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/42960913666.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/bb004f20485cebb6bdede9d6e2697af2/17459912068.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/zekozajasi.pdfIn PDF document text
    • http://allasclub.com/campannas/file/kolijiwunub.pdfIn PDF document text
    • http://www.agot.pl/upload/file/67802841912.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/nogixoliziwasokebowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/896FEnmJZlk/uplcv?utm_term=fill+in+the+blanks+with+a+an+thePDF 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_off0000d862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD862 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF079 10280 bytes
SHA-256: 4266816cc57c2182ea37e0380c7fa5a0531218459289bcb385866e863e3749dd
font_02_sfnt_off00010789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10789 19316 bytes
SHA-256: abfcec4d42cdf7c1853dc963f5dde8452cdc1fbf7dc9d37c69bac762fd7db6b5