Malicious PDF — malware analysis report

Static analysis result for SHA-256 f072f7feba5edfa8…

MALICIOUS

PDF

72.6 KB Created: 2021-10-01 04:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 82b81e46514832ca9c5cb8da156cdee7 SHA-1: 2ab51a32952624d6f112d23859f5c0fcbf3c7907 SHA-256: f072f7feba5edfa8e2c1426cc71dd16fa15bb54fc6ad8b35d1edb80ab4ecdda1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/42630163277.pdf In PDF document text
    • https://larustt.com/upload/ckfinder/files/31361713270.pdfIn PDF document text
    • http://ilkemymm.com/image/files/nukobojunumapetaxi.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed2301ed17---65339711435.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/5ra1kj3shju9gpe2afmo835di4/20553841673.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/51d22bf1ea321e6aab49b431cf420c6b/3608016072.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/72017401741.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/karadapuwufupixobiset.pdfIn PDF document text
    • http://vit-physio.de/file/24088903841.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359cf491cc8---4576309795.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/68625095435b5e309e42bf19237437f3/jewizivudewozosevilo.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16141ca770b30d---47875102888.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/90679563540.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/19919317923.pdfIn PDF document text
    • http://advertisingreports.info/assets/ckfinder/core/connector/php/uploads/files/gimavoruwurinodesevegegas.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/jajuzorivumumoruwebero.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/30347233710.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/23896330831.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/95634676348.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/37121119388.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/fipakomesurugajilo.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/lekuzatukupuwafe.pdfIn PDF document text
    • http://4bx.pl/public/file/6460557740.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/78320993485.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141b4c0e3254---72655831695.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+simplify+ratios+with+3+fractionsPDF 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_off0000b46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46C 10976 bytes
SHA-256: 9861d5cc7cb66058ce877c4616a32ebd1924fe65d328cc6e0324b5147d0002bf
font_01_sfnt_off0000cdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC1 18324 bytes
SHA-256: de4201c5fb40cef4f434a5002034f96fadcb076d676b0545e857c8733775332e
font_02_sfnt_off0000fce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1