Malicious PDF — malware analysis report

Static analysis result for SHA-256 5012f055249ac45c…

MALICIOUS

PDF

82.7 KB Created: 2021-09-11 08:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a07ae6add457c543728bd7f6be1904db SHA-1: 0a87755d9c18a5cc489aa4fef6242012e68264e4 SHA-256: 5012f055249ac45c44b77757f2bef4c5a556cfc75298317343d22bf485ec3ae7
156 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://editionsitaliques.com/userfiles/file/56925581501.pdf In PDF document text
    • https://vanphongphamhienluong.com/upload/files/8700456246.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/nuvadeka.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/56420669019.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365f2070791---xavulatuzavapixut.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/792c26fbbfc6f1c77534867166ee9720/69201641046.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/prq4v2d0irhrhb9mhe7ove3u68/29908630746.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/13965061205.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/zoratoxavo.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/jukiturawudoputimelepode.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/poridenukebozobowejem.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/gixiragapamagisegibuzuf.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/50107696085.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/78023240746.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/57602955731.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/wonesosi.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/90036371254.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/34115700709.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e563ac27f---gekububoxefanufujasupes.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/26331173521.pdfIn PDF document text
    • http://feminella.ro/upload/fck/21297425274.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/kuxuwelikunikugitib.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/9714558868.pdfIn PDF document text
    • http://one9five.com/userfiles/files/1847984979.pdfIn PDF document text
    • http://artio.pl/files/files/25895524442.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/supejamuzuniwu.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/zasuxebatovaxuwole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=hotspot+not+showing+in+laptopPDF 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_off0000e126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE126 17072 bytes
SHA-256: 59c55130ef1f31c71f7ecbbed5745568dceacab10a4e9514e1bebbd17131db42
font_01_sfnt_off00010d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D74 10376 bytes
SHA-256: 3d06084e44160e6efe9440b5ef297c6b9beb87f11b18644a0fe67fb725bf150e
font_02_sfnt_off000124e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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