Malicious PDF — malware analysis report

Static analysis result for SHA-256 56035bd12a938ec3…

MALICIOUS

PDF

78.8 KB Created: 2021-09-04 11:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b54f51e38a13ae1003e155a8210e7523 SHA-1: 969b5f28726e46d6e946582822bbdbb452e67962 SHA-256: 56035bd12a938ec3a5c47ea581ae4af87c6aecc3838eae105c2ae310f636de78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and is identified as a link farm, likely intended to direct users to malicious websites for phishing or malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to lure users into clicking links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=kenneth+grant+libros+pdf PDF link annotation
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160836f07bb7ad---jaduvomefuto.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///27806347186.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8a36dcccb---66306739819.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/gisunimijemizeromavasad.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/fedoxotexaverip.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/79420560947.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/86567605297.pdfIn PDF document text
    • http://deforma.it/userfiles/files/6784198853.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/54324677702.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/dec0951325f9482513160a26d46005e3/lijukoxuduvutaxasafap.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/2fd200b7036cc155ec0e4dd66e7a76c3/pisuz.pdfIn PDF document text
    • http://heizler.hu/files/file/46557262864.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/gazevezupegudunifadojoliz.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/71537023827.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161155bc759ba0---fesejejitasokugalelamiban.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/0e9t9gauoq7r30c0mpvig4q0m6/lotitelu.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/12415748672.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/zasovixidapevasevatesija.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/23025181338.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/jipedajatoradelakagafisog.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5114e0927933d6dc04d4868584b808df/vajerawiki.pdfIn PDF document text
    • https://ksboutlet.com/file/files/boradipede.pdfIn PDF document text
    • https://careoncall.in/userfiles/files/voluwuzeriwemomuzakelemem.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/12472133460.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/ea993571dca98fe2c30ebba96d442af8/31338110893.pdfIn PDF document text
    • 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_off0000cba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BB 18000 bytes
SHA-256: d5dbf32ef91c0a5f4f906b50eca6606e1bee88e1b8eff30529ea8d740da53179
font_02_sfnt_off000112cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CD 10908 bytes
SHA-256: f85b9dbd1d3db7b69dc4f92676079e76209bd13da55d9efdffe7e831d99211f4

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