Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c78bc96fadc3df3…

MALICIOUS

PDF

87.1 KB Created: 2021-09-02 03:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 78ecd2ae9c5fc06913d24aec241c765f SHA-1: f4c55e7cb0b5c1ef8a37befcc2480a41e061e879 SHA-256: 7c78bc96fadc3df38cf15a75d26db1325c33e526a5dbc938e0381297a55a0828
176 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple compromised CMS upload links reinforces the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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 http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8e9c46594---20904952388.pdf In PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f6d8fa6eca---boxidumasolitigurixezure.pdfIn PDF document text
    • https://dineflon.com//files/mekigatulugudalumasij.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/patozod.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210510/210510025257770152ffbdr0ejkhlw.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/a4bb43b1d084e50e234b6d96d4d478a9/36584878830.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/3670611346.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/92838844207.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e0bc12a7a---26770004550.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba47d0b2270---74532237707.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/tikirutanifog.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105f10e2eb26---33175341840.pdfPDF link annotation
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/pvdfjkp0mrvqce9sm439mj33mf/68305475874.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/adefcec55e4e6102718e0bda53af545a/pumomimonuvuwiv.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc59e0a87d5---baxunakidozubegasaz.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/85837244873.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/456cd75cd9d1f4bc2be3704d40dde6c3/42391202195.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d22750cbe76---zudokopefilofa.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/xotene.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121b79255a4d---famozaxejepekojowukafuluj.pdfIn PDF document text
    • http://adveotec.com/img/file/gunorolumija.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/tuxulepeb.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094bbde341c0---40903868563.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/nutikisekupup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+grinch+soundtrackPDF 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_off0000e9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F3 10756 bytes
SHA-256: 8a3ec9a9babf4f5ed09ed77939e116b664c1a61c49f88a48cdb20118f422fc4a
font_01_sfnt_off0001027e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A90 19656 bytes
SHA-256: 847dfb1f962726c0d438a1e3d58fe4e45cadc6c27ad1f0bb83dda83586a66f88