Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae423e9354f6d796…

MALICIOUS

PDF

74.6 KB Created: 2021-09-01 03:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b45c2edb2027fd96d9e6cd505af9e2ab SHA-1: 6794460a7742d1fb08eb83d6c66b8d7731e58655 SHA-256: ae423e9354f6d79618fd824b3ac984e4cec552716274bc4011ff8cd05934b486
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to disposable hosting or compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://dgjst.com/upfile/file/76949392318.pdf In PDF document text
    • https://thefertilizergranulators.com/d/files/katasaxixuf.pdfIn PDF document text
    • http://www.rotudavid.com/ckfinder/userfiles/files/varilefebinapoje.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/60748081568.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/130dbbc7ba75b91f8e35e3c0f74a5485/timelemo.pdfIn PDF document text
    • http://demkapi.com/resimler/files/65814067011.pdfIn PDF document text
    • http://zuestag.ch/userfiles/files/subagabotetenebumap.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gikix.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da909a82c0---18248950017.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/3ddq2b6j478v9c2gljq889lt73/90836429940.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/xugedamerita.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/89995585013.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/97790347334.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/77949407738.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/rovexixajobisixaset.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d055e365241---xofutumopojik.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806ad4adbd4---kigajajizonu.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b9093a2bf---luxidifijewopuxuvikaji.pdfIn PDF document text
    • http://aqcons.vn/upload/files/getoparu.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/55477982815.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/zolumelozaru.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/51323070507.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec9d2ee705---satijor.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/lubapezipikuliz.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/5424868389.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f013f218ba---60829115100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=project+on+central+bank+of+india+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_off0000c09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC09C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AE 16684 bytes
SHA-256: 14052cceaec45c45aeb391b5694dfcc66a99b1d4404e741883a692a736b5dc40
font_02_sfnt_off0001041b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041B 10808 bytes
SHA-256: 192636b8d6933e373139698a150c433df7caade679d81703b10b386963d53059

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