Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c0bf7566151075…

MALICIOUS

PDF

82.2 KB Created: 2021-06-28 05:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4052629284fc6c2dca551783918039a7 SHA-1: 6a089b1676befddd5a655e010a64416826169bcd SHA-256: b1c0bf7566151075c511853a3f81f0001a9ab1c3f930975b7beacc1bd329b3d0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the structure and embedded URIs are indicative of a malicious PDF designed to exploit users via redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://riolospettacoli.it/filesUploads/file/rumuniliruwunatefu.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f4f4b031e---fubibofufipor.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160839701317d7---befowobulebodijiji.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/06vlq1nrrjunl249sb2pi723nu/7646968934.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/74af2ba096783efc78cb4a24f5f5eda2/49014783637.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607914d4c3620---dopepufizaz.pdf
    • http://porpora.biz/imagenes/imagenes_contenidos///86263584743.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/m9mvlq6he5ai9df4c7g96vgbi5/43304439861.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/9peap6h563cjco8goqdtffqen4/38333048708.pdf
    • https://vigiweb.cl/dinamicos/files/file/povitikodo.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/s508erk0th0v97ab1a0ngcmgkb/16040596859.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608423ecc79e1---gorezo.pdf
    • http://www.hangmandigital.com/files/file/vowefefemapugutavalijivo.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/cff951fcb7de70c9bf0b8b6838d981bd/86394522292.pdf
    • https://mama-light.net/business_school/uploads/file/jotib.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/xoduvasopugo.pdf
    • http://rwdwebwebdesign.com/img-aim/files/menatuxarape.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/cod2jkn8g4kmceo2hi3g02gvi1/rotuxaxiwabulezewawubakik.pdf
    • http://atomleasing.ru/media/File/doxikababeru.pdf
    • https://netshopnepal.com/userfiles/file/91840367353.pdf
    • http://asckhn.com/acskhn/userfiles/file/55233908097.pdf
    • http://akinmedical.com/uploads/file/68750135187.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/cdf0a08001e8cafb9910a6654abc355c/metaxe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=world+without+school
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ce.bin
751217863407215894a4739a490ec21dbac1a2efc8b6d7d1d084b457b172afa2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CE 10248 bytes
font_01_sfnt_off0000fafe.bin
e20fe952b374ce3948e337f58460d8af6e986eeb796b23b96ba878423a602833
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFE 15856 bytes
font_02_sfnt_off000123ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123AE 16792 bytes