Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc9f95649bccf63…

MALICIOUS

PDF

79.2 KB Created: 2021-09-09 23:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 33bc18ef8f85c8427692beba422a6c51 SHA-1: 464dda016050a7cb67ccc8262a198a7c70077b96 SHA-256: acc9f95649bccf632315cde97b0b33ae0cfaa3bba1ae7024e8c0312bb4fbe1c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No specific family could be identified, but the techniques used are consistent with a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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.
  • 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 http://tavio.su/files/file/mepotelelifunemalo.pdf In PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fac004210a---gilegoxoforutumerazevuzi.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/xebukonivexumuteroj.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/7483645963.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/763ba099b8ab48e631b26d1e4cbb729f/24357681836.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/vafuxurubemufakiwolad.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/batijasavaw.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/47473211122.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/15039950077.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/21619209582.pdfIn PDF document text
    • http://maulich.vn/attachment/files/vatusadewedaripu.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/58541718537.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385d0a619a9---9654115700.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/61226499969.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/mavexiberazivepu.pdfIn PDF document text
    • http://imoroz.by/upload/file/40484368979.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/7705000936.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a384b33fa4---34367790036.pdfIn PDF document text
    • http://didopack.com/files/33605115542.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/revavozados.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/7314087356.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/40710532100.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/mofer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=connect+android+camera+to+macPDF 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_off0000d1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A2 10348 bytes
SHA-256: 9683265e8ba987acc3a9fc67338691a04abcbeb760907029121956e35c9d3613
font_01_sfnt_off0000e8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FA 18020 bytes
SHA-256: 755e9837c6233d18110f5e62e09d0ba0c315de57f761662d625d755c4b31f15a
font_02_sfnt_off00011761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11761 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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