Malicious PDF — malware analysis report

Static analysis result for SHA-256 247b0502e22d7c07…

MALICIOUS

PDF

81.7 KB Created: 2021-09-08 12:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f730c6d34a0d8beaf2560f08744e7ab7 SHA-1: 08ee1a6332185cbafcb979f1016b151dac8f26ac SHA-256: 247b0502e22d7c07c059850a4c895495e139dfc2cc4087ed3519668947a30015
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or link-farming attack. The presence of these URLs and the overall detection profile indicate an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://infrive.ru/uplcv?utm_term=manual+fiat+doblo+adventure+2008 PDF link annotation
    • https://sakkestadbil.no/userfiles/file/21312806246.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/34630710960.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608455d92a282---soduzujekumejomewawekuwiz.pdfIn PDF document text
    • http://chromatographvials.com/d/files/90629657853.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/48710962348.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/9cabab857bc1fc9c5c8147c61362a1f7/51260878763.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/11115854503.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/10009833673.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/teludewasubafezep.pdfIn PDF document text
    • http://rococosofa.com/files/files/tonur.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/milomipelexis.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed7dc90ca2---vukimabex.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/3910612083.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/mmhv94bft8arp1f5e95oc9pri7/97149765088.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085205693469---wozumovulij.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/vigorono.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/tegesunekune.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/96404830837.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/7480798238.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/zotesarew.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/2v2b2tno5kbgqjnnoebd1pe905/lilabudavomazawes.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210813095211_2j789c.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/er08b2cgesud46qbrcul6vgu48/31350153563.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_off0000d638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD638 18852 bytes
SHA-256: 3fb7046fc8f38eac3e38c410548d3e971623672c99263671d0f7bf32d536f7fa
font_01_sfnt_off00010744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10744 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5B 10928 bytes
SHA-256: 3341469d276fbfd34c85cb6bdcbba702386fd976feb26a7a58129f8efcccdfab

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