Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e505ed2f75a053…

MALICIOUS

PDF

81.8 KB Created: 2021-09-06 16:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 083e7747912a7bd6333f1ac249cdd73b SHA-1: 1c4cb1023984056cb0b3ce5af5da41fd8c398323 SHA-256: 71e505ed2f75a0531d1b8d1a57cdd5bee831fb67abcab7abf7d92f709d284c14
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking readable content but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://dialogueinpraxis.net/files/docs/72283150534.pdf In PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/j4hlrhv7k5lmsm229f99bgmj7k/81676122946.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/888j3a50hrup3q201ggag64qdo/nijoruvefufexedex.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/fa3801b7b19d1eb680f9b904a5ab0203/latimesopexajuvakij.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/fesuleveregunisis.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/wogobaxefinuwukuxaxoj.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/0ba8b17dbfd8bd92e063e43df46e2b6e/92394431863.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/27893822412.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/teledejetoxamezaloja.pdfIn PDF document text
    • http://besteva.com/upload/files/topesazutomudeje.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/42445017009.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/pv86r8tdoi559ta3l2o69t99fc/numudijiwe.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/5604759585.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/jogasukiri.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/joxozujegig.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/babidujekofelagonowew.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/5dd72b4eca9c73ad4ffa3c998e647ef8/51635523650.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3506bd25d---sizidewoguwawej.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945106ef77d---23158328125.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/revevakotaxupujamelogovif.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/mufejurezuf.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/desodebure.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd6a69ae0c---jupozosidogu.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/9cumiheci8mopb5k59emic53md/43882036106.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/labokimilotodosugu.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/zadetepabuvizogob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cybex+pallas+2+fix+anleitung+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_off0000db65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB65 17024 bytes
SHA-256: eaee96f4957a9d24a5bc8aa3d6f56be2b353290774406d325c4aad706862d754
font_01_sfnt_off0001078f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078F 11060 bytes
SHA-256: 655e45afa7f22de4146da50794d9eb96614baa03761cfb72017c257937c0dfe7
font_02_sfnt_off00012121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12121 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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