Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5e8c3269886f8a…

MALICIOUS

PDF

77.6 KB Created: 2021-09-20 21:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61d3db339a43b72e799ef235a07c50d1 SHA-1: a374b4d9c1e61be137f5366a65d7a22e41ed0584 SHA-256: 7a5e8c3269886f8ab08526cb88918e92c82680ddc073cbd612139508f2cff1b1
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=facebook+wont+load+on+android
    • https://i-chat.tw/js/ckfinder/userfiles/files/42070055877.pdf
    • https://residenciasanamaro.es/userfiles/files/58303972871.pdf
    • http://vidol.eu/userfiles/file/fivujoguligiwojupi.pdf
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/86668336559.pdf
    • http://www.galiantsolutions.com/emailimages/file/75878382202.pdf
    • http://aranykoronakft.hu/userfiles/file/rofazukumoku.pdf
    • http://185.33.116.142/~bbyacht01/upload/files/zujazo.pdf
    • http://contactfm.be/userfiles/files/78006485011.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/70ivtjtfq5uot7f6sjtigg4ec1/zuvuz.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614144c320d6c---17863234827.pdf
    • http://mayjack.com/upload/files/tewawafutafesikivojam.pdf
    • http://innospectrum.eu/hirlevel/file/27350067681.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/0pqcij0d98enfmq5dbqjer65ka/kibofevukexupunifupipu.pdf
    • http://flyingkirin.com/uploadfiles/file/151923218928.pdf
    • http://pereplanirovkaoblast.ru/pict/file/5092755174.pdf
    • http://cungcapbaoduongcuanhatban.com/upload/files/2189183927.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f02f656585---tuzebigurogebu.pdf
    • https://www.delaneyllc.com/ckfinder/userfiles/files/93994959561.pdf
    • https://pacpartner.net/images_client/imagesfile/39221974615.pdf
    • https://rdsdealers.com/ckfinder/userfiles/files/39090990811.pdf
    • https://homecareangels.ca/files/files/files/27201442947.pdf
    • http://zrdb-drogbud.pl/Upload/file/46126502207.pdf
    • http://origo.ws/userfiles/file/74803991546.pdf
    • http://muszempilla.com/files/file/111398909.pdf
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/60323054836.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb93.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB93 16792 bytes
font_01_sfnt_off0000e3a5.bin
c46871971180434766e95c0ca7624d1667803c7f62de8a74a94ea31c2ecb3de7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A5 17560 bytes
font_02_sfnt_off000110f5.bin
60361123545a77a7e3753462f42862e7831617c1b8c4458579f30489c68f184d
pdf-font-stream PDF embedded font (sfnt) at offset 0x110F5 10492 bytes