Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2babb2ae484eb73…

MALICIOUS

PDF

74.8 KB Created: 2021-09-04 18:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8435ee56543a50d4438fdf1cc737e9ac SHA-1: 98700fc63a3c3ba98a2cf17e23e399e95c11001d SHA-256: c2babb2ae484eb7348369749dffde7f8e0bbc1fd0fc7182814eb712d1573c0d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm pointing to numerous external URLs, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, likely leveraging user execution via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://takitech.hu/userfiles/file/sexadugigapufifatinusoban.pdf In PDF document text
    • http://wskinbody.com/data/boardData/files/85049288246.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16072496717d13---89289620864.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/28370485091.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/da26abdaaa909086f07eadd103cd12d7/40692538829.pdfIn PDF document text
    • http://cy2hand.com/userfiles/bozamozufetirak.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/81236344780.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc41e75a39---33305481099.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/42587273483.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/zuvagixa.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/60975886033.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607379964dbb2---16284991658.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/c11218d52b88e573ece1a1a2aadfb2d5/41265748866.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210520231349149.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/selax.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/h41ei8smi7dmkhovivsv7hidh1/55223065469.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/a156e73d4e90d4c9d6111ecf30f677ae/fefolibiselebekozuba.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/71a324aeb6f6da23501a781bfbbcffec/29292183378.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/78577557240.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/ad98a86de82ff89a26c7e9fedd481d95/88087035950.pdfIn PDF document text
    • http://jinyezi.cn/upload/bamexoxifivutagizuf.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/kaposerazuxito.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/1b73b8af5cd78e5f82b65088e83187a6/27229554345.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/mapoludimumiduguxi.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/magoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=holt+mcdougal+literature+grade+12+teacher+edition+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_off0000bf90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF90 11160 bytes
SHA-256: 532ad00345c0ded93f603280b6b98db1378fc0866f64a5f4969c9132a725326d
font_01_sfnt_off0000d945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD945 16060 bytes
SHA-256: 5905c18fbaa6218e4968818373982e9375af534188dfa9e932962f6e78e387a7
font_02_sfnt_off0001028d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1