Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b7598011e7b7816…

MALICIOUS

PDF

85.6 KB Created: 2021-09-17 06:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27a1e6d401f8fbbea6d6a1d765278628 SHA-1: f224b4c0aac2a249692c8f37c4dc3b9a190eddc1 SHA-256: 2b7598011e7b78169c832d4168360d9c1bed6d3d4cec3026e7929df3ee05b122
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document exhibits characteristics of an advance-fee scam, including language related to lotteries, prizes, and courier delivery of funds. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://crewmak.ru/uplcv?utm_term=best+free+photo+editor+for+android+phone
    • http://flightshop.jp/images/blog/file/lujorotugunaf.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d6b7921c30ea175cf8263e124d087da/45867441388.pdf
    • https://kamhosting.nl/ckfinder/userfiles/files/92009088970.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/af58f964b0399339691d6cb2c48b2e54/13791353168.pdf
    • https://artistaone.co/userfiles/files/31346574041.pdf
    • http://driver-jazda.pl/upload/file/80516172021.pdf
    • http://lehnerkom.de/images/uploaded/file/sutowiwatevi.pdf
    • http://jgweld18.com/UploadFile/file/20210904005105382.pdf
    • http://celeb.huh.hu/UserFiles/File/levimob.pdf
    • https://inprovitcaribe.com/ckfinder/userfiles/files/33077531686.pdf
    • http://mexxeopaint.com/upload/files/sakodevavujomiwisetoduzik.pdf
    • http://e-district.org/userfiles/file/rumiborapi.pdf
    • https://bluetact.com/ckfinder/userfiles/files/14321410568.pdf
    • http://ekvatorbl.com/userfiles/file/vevidipatuxep.pdf
    • http://rockhouseschool.com/rockhouse/uploads/files/wedoses.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16137d84042074---5629823624.pdf
    • https://abctranslink.com/ckfinder/userfiles/files/gupeperuwevopisafazaj.pdf
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/xusetes.pdf
    • http://woodbridgeabw.com/uploads/files/mefapeb.pdf
    • http://sunil.kr/uploadfile/fckeditor/file/38901182066.pdf
    • http://happysmilecard.com/uploads/files/85975545789.pdf
    • http://edmo-cars.nl/images/file/zivepasas.pdf
    • http://sarkar.ie/userfiles/file/rosonudan.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_off0000e8ef.bin
1af6bfe1436cd8faf956235f3ef82ad751d9fd6825f366d2b6965be5bc4a5c76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EF 10600 bytes
font_01_sfnt_off0001011e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1011E 16792 bytes
font_02_sfnt_off00011930.bin
b8c3fbec1ac89b3d7b9899f8a1f20b2caa51f502e0bc93fec282e85636c6cc03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11930 18240 bytes

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