Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b142471b148836…

MALICIOUS

PDF

82.8 KB Created: 2021-09-02 16:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 02baad0a92f0376ee6d194bbeaeb3eb4 SHA-1: 95744cc00e0bab38b2475d0adff6a605e6de0ea0 SHA-256: 05b142471b14883627adaf7665e00fc316f7f4db7acbe1d8fece6cc91c1a583f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://huntic.ru/uplcv?utm_term=2001+mazda+mpv+owner%27s+manual PDF link annotation
    • https://ddshower.com/ckfinder/userfiles/files/tagiwivizabutipe.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1bd56c414---40514359784.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/fifojonag.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/zozefipozalutaxenan.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f40da2e319---350044828.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/murunewojulitab.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/61685044758.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612a41e81051c---92312096657.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/48847703982.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/rhmsrdkrj4vvnjg0loqnbq31ks/10008783631.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/biverefefara.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/f7b2abb835372098355d30011c9104a4/74866171955.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/64769520080.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/27588054028.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/nuziwapowurafemibaz.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/a212d1e60a744ce05876f81787d4cec5/74362912128.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b9185f26d---bukagaxexolarumelar.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cadc1269e---darurulosunasabawuweb.pdfIn PDF document text
    • https://lusagroup.mobi/images/website/user/files/fenumujojulov.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/520b7d47c3a10c7b0c4d2a9b50b13bec/65377574698.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784a86c2743---guwopizifuwuwesute.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/xisitilezajerutenuraxir.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/xuxoseredupirew.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081590876b89---76802511501.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/41277011864.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/bipunizi.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/274205378.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_off0000dad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD3 10908 bytes
SHA-256: 14c7f361f4694c039407e7cc6eaac06f7141ec6ed073062047a6d4ed3202af38
font_01_sfnt_off0000f438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF438 18632 bytes
SHA-256: b0708a7987d26217a1a80f832c4e0f326c211714e5e42266ba8b14b0411ef044
font_02_sfnt_off000124f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1