Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fbb976d761f2a71…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 15:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 000ee43fe21c4385046c933fe53d6b8a SHA-1: ff1ab350b70d15678a8de8ca61da50874e065397 SHA-256: 1fbb976d761f2a714808469c21498ef3c1f954c23ba39464c9bcfbab3f87d1db
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The document body is heavily obfuscated, but the presence of numerous links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://cnokorea.com/userfiles/file/73884869613.pdf In PDF document text
    • http://kasaitogo.com/uploads/files/2332286090.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/fegulitedokegijiw.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16134979521ff2---14412384877.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/wubifamab.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/konaduzotetuxuboxepejode.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/6svekr4n0jkre8snogft3mj032/fatekagexofenob.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/11924872280.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/modegijuvenuwezaxu.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53747639682.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/febob.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/27481615106.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/63086734419.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/kuguj.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/h9vs18qfgo56tbaod2mcu2adg0/dapidamap.pdfIn PDF document text
    • http://hexindechem.com/upload/files/30289020511.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/pofixuxenokiken.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/96997260007.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/31372725388.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/jalit.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/81640879774.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/pulukokopemanipiti.pdfIn PDF document text
    • http://riph.pl/userfiles/file/95720126151.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/27386804631.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/33732725434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=angularjs+qr+code+scannerPDF 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_off0000d323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD323 10712 bytes
SHA-256: 6861c56d74c2811275da3ba92f7965154efebbe57486d86853cf25521fd60a27
font_01_sfnt_off0000eb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB67 18280 bytes
SHA-256: 804f40302e7319afc25fbd16cb82269c560a895045357f4d8aa8565bf4df6cc4
font_02_sfnt_off00011c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.