Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5098a365124e71…

MALICIOUS

PDF

98.8 KB Created: 2021-08-16 04:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8fa4f535100d4eca80613fbdc67081ca SHA-1: 67b8af44b4400f74478d0d2d2a022cb80f0bc064 SHA-256: be5098a365124e715e08899f58739e56b3a60285ad28268e702c75f0e30bcb4a
196 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links that point to a variety of websites, many of which appear to be compromised WordPress installations or disposable domains. The heuristic firings indicate that this PDF is acting as a link farm, likely intended to lure users to malicious sites for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://allytemp.ru/uplcv?utm_term=how+many+grams+roast+potatoes+per+person PDF link annotation
    • https://pet-fashion.ro/mm/file/kuwisopeti.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946efc9ee79---setobaporomugi.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086db3fbb942---15186036437.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/gawifosalamatuzudoduwe.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/8688a31f2c439acf0b9320de3b125f9e/37739907111.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b720983d72cb07ac5c16d7f7b261db45/95351457622.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/8627640570.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/25603414780.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089d1976cc53---49625888347.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/14968289706.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/1c12d947a7bd07b05a7232e64bc40926/xiladabot.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/tedogep.pdfIn PDF document text
    • http://vivaldiroberto.com/img/files/mediafiles/file/51612243671.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/e0e37887b6686348f8c994417fc6c5a7/nakefiz.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/begezewipi.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30822838965.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/wojixawabunagepubeguso.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210805211614.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/dd743891a048ebaba07830418c452d0a/20328582100.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a07fe01218---7243133669.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/fimutafibibibami.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_off00011dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000135e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E3 17944 bytes
SHA-256: e78bfe583e436ee7f6f449ccd3aa5fb177a6405fffa6d42f7b32b831be816696
font_02_sfnt_off0001651e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1651E 10648 bytes
SHA-256: 5907bd5c66a423cf429df8d0ca3211a693072e6311b1dc7146ad877c2f17999c

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