Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1fc31e6e7f3093…

MALICIOUS

PDF

86.7 KB Created: 2021-09-09 08:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5bfcb65c0a3359836625344a1abd00ed SHA-1: dacdb3a6460642cf9c6bc3e56369e0892b2adb93 SHA-256: 4b1fc31e6e7f3093a69fb42b0a1865e346cf340a996c95dc31c0ec8327497df9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, 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 external URIs and link farms points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://oniceh.ru/uplcv?utm_term=stream+video+on+android+auto PDF link annotation
    • http://www.naturhalles.fr/fckeditor/userfiles/file/5824229386.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/jagusosopemarivone.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210907_135112.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/subegi.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/20751408219.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/wowugarurajilarokazo.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/tamaxododafanuwom.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109020548498930.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/mimirevixebufitu.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/babutesaxodisarelizumu.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/32668023384.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135fd4db84a8---zoniligigakizusakelubux.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/xofedufobeseribelixef.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/96304085520.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/mowarunoku.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/44968294952.pdfIn PDF document text
    • http://josquin-capella.de/download/sedanalinoza.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/c578fe43c857f9bb13145fef450a5037/84873495955.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/gnppgq3gred4053i5emmnbb27l/wigin.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/52030496586.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132d7143e825---fetepegizaxekaduwemomutum.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/8285704283.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/80043601224.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/636969c89d3226d82f2c8ba2cb14f72e/31935827820.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/56814773309.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/kekun.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_off0000efa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BB 10436 bytes
SHA-256: 40b4e571d294b22969b87a2626345752feeccbc5ae606bb8323cee18b3f5e984
font_02_sfnt_off00011f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F69 17840 bytes
SHA-256: a8b67f759f5e1d782db58f285db9ceb62a290e881ee00e5305eb9270a45699a6

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