Malicious PDF — malware analysis report

Static analysis result for SHA-256 d514dc1ece201132…

MALICIOUS

PDF

85.5 KB Created: 2021-09-04 23:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a2dfc53ba5863242feb832e246f34969 SHA-1: d3b867cb9b4610328cda7564eae8eff408452f30 SHA-256: d514dc1ece2011328bdf2c6f319b258ec6cbe0d435d2af90a29523fb41f2c601
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The PDF structure and the presence of multiple external links suggest an attempt to lure users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2e28439d6---jejoripokirumikogutab.pdf In PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/48375300753.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/tojurasebob.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/77711972194.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/84520420842.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210707095154555.pdfIn PDF document text
    • http://berbun.com/user_img/file/33569409658.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/d11333542fabfaa077af6a95bd40bcd3/kozez.pdfIn PDF document text
    • http://chinalabware.ru/d/files/71353884117.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/nojigi.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/wates.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/6965224000.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/4b2f59fc89ee72ab137920ac0648e85c/zogala.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da7fc64c938---jumizipugaxafosetezar.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210803025321_902039.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/84161588832.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/luxuxifaregawinuvibod.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fb956c15a---zizudupediwakowogavifa.pdfIn PDF document text
    • http://inercial.es/uploads/files/89028664005.pdfIn PDF document text
    • http://cichanski.com/Upload/file/bojasozanavebojifarabo.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608015e0c41b0---vofibiwufobur.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/8007575894093f961e503cf956a4fa3d/48902135420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=midwifery+and+gynaecological+nursing+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_off0000e889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE889 17756 bytes
SHA-256: f592ba438561fee1e2ce215d3aa9f14b1dd1a751915b26d3ea543148f53aad6a
font_01_sfnt_off000116d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D8 10988 bytes
SHA-256: 98e350ac7bc1b12e0249aa5995dc1c9ed8ba723c7d222b8a39a386e40cdc0b85
font_02_sfnt_off00013056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13056 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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