Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f78caf84d2869bf…

MALICIOUS

PDF

74.2 KB Created: 2021-08-28 04:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 88975e2b04c39d2b589382d8f6a41d13 SHA-1: 73266727587c892e1db5739e50789ec08a9749e4 SHA-256: 1f78caf84d2869bf3a4f754014e051bdb2968434b20a515996b29341c6e61b23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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://labsshop.com/d/files/89999347993.pdf In PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/13794986295.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/85422856706.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/28148139792.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161042381002e4---20400068676.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/39016600700.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202108/file/210810114936189142z9lrup2556tv.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/dfpoam0gasknkb4suu5rlbonhv/4785882998.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210621153628.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800bec4a687---6906614962.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/14999062302.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce3b834f75---wevul.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/86519485971.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/rivekagasorajikifox.pdfIn PDF document text
    • https://stvorki.ru/files/file/40273565155.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/65842540850.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/wokadumapisexetuge.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/38261940091.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16078017d8b7a4---videreselalofumepamof.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/xaxeguzuwunisid.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/zexove.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b34db8118c4---63181616673.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202108082008057442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=mpr+classical+streamingPDF 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_off0000c152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC152 10588 bytes
SHA-256: f41980deb020a96d60d7638b368192b4e992fce6b7c780ca34484dc9cf116f8d
font_01_sfnt_off0000d97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97E 15984 bytes
SHA-256: 9b50ff670beb47ec38e4262fd735d710aa1ff418dd11a7f3a234abfdc1c5a952
font_02_sfnt_off000102b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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