Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81d38c17a8a70f4…

MALICIOUS

PDF

77.8 KB Created: 2021-09-03 01:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 10043eaefdb34c12b63b4b90ce3da258 SHA-1: 717d8414134323c5bb291db01d1b5ef61f3611c0 SHA-256: e81d38c17a8a70f4789fc58c5f83f913ce310a59375da5db50af5ea11ffb6a02
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites that host further malicious PDFs. This suggests a multi-stage attack designed to lure users into downloading more harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d1a03775a---danurumamukebag.pdf In PDF document text
    • http://boldogelet.hu/media/sixunemakikimatifutuxedo.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3eeb90e72---33709977209.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/jidv80nfau67q9gqv8qpdu7jte/179965010.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/fidorenisowavozekavafa.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210707_0FE5486D944FF541.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///62110917978.pdfIn PDF document text
    • https://unitjaya.com/contents//files/vuvojos.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125538d03592---30272734740.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7926c74fab---46382050262.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7669da06d---rajevosagev.pdfIn PDF document text
    • https://nexapos.com/upload/files/71661115577.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/77d1c60e8c5e62e2687a60a8af3d7454/norisiwituk.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/sefevazifatex.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/525b7f78b1d397ec2a284bacc5d7efc9/93133953328.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/45826148115.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/xudemoxajazivatibuvagudew.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/c78d126eb6f20eaeebe281998e4623dd/seduduxovi.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e0955aa1a---wexanumole.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/75687377184.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/31180778360.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/155303331760f08dda663f1.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/cabbf251af9944448625795b964875bb/64335372485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=place+value+grade+5+worksheets+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_off0000cc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE449 16760 bytes
SHA-256: 3a8da3aa5876f9a7f9893da0e43145f62aad13118320a666b8e887d08b6da824
font_02_sfnt_off00010f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8B 11180 bytes
SHA-256: 65e4bd6666b1df471b45380ab3efde88f54e74751a850611c5b19809ab67ad93

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