Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88ae2affb9a3678…

MALICIOUS

PDF

85.6 KB Created: 2021-07-05 22:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d58f37cb4f2d09666d28f10e4930218 SHA-1: 09092372cdb66b77228690cae31cd85a789bd298 SHA-256: d88ae2affb9a36787c4c3df0bb7afd5d0f24c6dfe0d5061386265f85e54a2573
196 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. The content and structure strongly suggest an advance-fee scam, specifically a fake bank overdraft notification designed to trick users into downloading further malicious content. The document contains numerous links to external PDFs hosted on potentially compromised or disposable domains, indicating a link farm used to distribute the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://tulsacentral1963.com/clients/3/39/398188050227c7f1c8b3045a0a865105/File/81450055162.pdf
    • http://obchodsezlatem.cz/upload/files/kaginorebapoxo.pdf
    • http://eortak.com/img/fck_temp/file/130732244.pdf
    • http://yuha.be/_files/file/kixafikopimuvalu.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/1mbp1hoaacpred6vaneij8bmkp/rudivitejafuzepo.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608e56cd8e207---mumoxugawi.pdf
    • http://katachizu.com/img/news/files/xurof.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0e89e7d55aafc3559999d7f3c1e3f197/wagobakawitazi.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/26862251698.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/bgih62125hktp3154agl3h0vf6/ruwep.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608774a25c7ce---7431361592.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/0aeff1df9163561b397851cef3adb04b/refusiwikiv.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079f3dfb68aa---jometulikesomogepamalos.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/46345a32f26de93a33db95eea66a650c/14935686321.pdf
    • http://seksdagen.nl/userfiles/file/daxasof.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dcd97c68b06---13982479678.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/7durnf86jhugbvbbcrlko4f426/70488991775.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b4f8c5c4b---54472514262.pdf
    • http://bdn10.cz/files/file/88781731847.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/9s5gff1snhlu2205drdrdrorr2/54546506271.pdf
    • http://nextgenship.net/upload/file/20210623162447946551.pdf
    • https://hse.tw/upload/file/labibegiwujigoperuxim.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/16831591769.pdf
    • https://jotekonybakterium.hu/userfiles/files/wavelojomixewelikep.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd8c3da206---57860238332.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=bank+overdraft+in+statement+of+financial+position
    • 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_off0000eb3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3F 16792 bytes
font_01_sfnt_off00010356.bin
f968c31eccd1250a8fc8956b92195efdee51cf73aabac1e3b85f7a7f2db0259d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10356 10992 bytes
font_02_sfnt_off00011cea.bin
479dae985116b01da98c7b4fd18f71c1eacba1f571426a00564fb542fe10b686
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEA 17144 bytes