Malicious PDF — malware analysis report

Static analysis result for SHA-256 891a344834398b00…

MALICIOUS

PDF

71.8 KB Created: 2021-09-06 06:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 78e9f97f60aa3a4deac8563160f789f9 SHA-1: 7f82328063dffb78cdcf4583e79353f907ec03ac SHA-256: 891a344834398b00c0cce68bc0d20bfc8dc196b440876215a0e31cf7dc3fd873
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or spamming campaign. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan. The document's structure as a link farm is indicative of an attempt to drive traffic to malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ivanda-commerce.hr/userfiles/file/72780576593.pdf In PDF document text
    • https://agatanorek.com/files/file/mufijukozuvasopuvegixuj.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/zuvoniteni.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/xobumomijovam.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/jq7mn69ddgedpjrrrap40svvul/51487208454.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/57940149415.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090f421eb598---45813577079.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210823_102644.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/87732597239.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/55533556656.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc64fe11f6b---lejavomegisala.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/91383637563.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/76129769169.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/89611394857.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/xitutano.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/lesemunar.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/36462654765.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/xexamilipibivobizax.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/3nbg19o0455pbttn0iid0t3kqq/92835425990.pdfIn PDF document text
    • https://miet.hu/kepek/17100787765.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/dd9f0552d931cd597dfc4de0555cad79/69229753660.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/bebunitaxidobafesanu.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160858782ef54e---jilew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=multi+level+marketing+business+plan+pdfPDF 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_off0000b83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB83D 11112 bytes
SHA-256: c1055b9913f437843be352f391682d9e45d822d058c61948d2209922645fc413
font_01_sfnt_off0000d1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CB 15464 bytes
SHA-256: d55fbcd3136c507c18824c58708b4e8b2e2af29abf0e43edd3f1bfa7f74fc7de

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