Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ce33a5ea4981113…

MALICIOUS

PDF

89.9 KB Created: 2021-09-04 14:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 12ae98f1e617692e41420c13b06a97da SHA-1: e6974bc4b4006d097a2463b4a9d126a4f8d4e4d0 SHA-256: 2ce33a5ea49811130c4d8c003754e09ca279c588f5138b3306a199816b713fdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The embedded URLs, such as 'https://huntic.ru/uplcv?utm_term=job+satisfaction+of+employees+in+banking+sector+project+pdf', indicate a pretext of job satisfaction surveys to entice users to click through.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=job+satisfaction+of+employees+in+banking+sector+project+pdf PDF link annotation
    • https://www.wemservice.com/ckfinder/userfiles/files/77664855957.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/49077182127.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/18055582757.pdfIn PDF document text
    • http://vce34.ru/attachments/file/37991605384.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/78277188873.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/e2625cdd2c4dbb7b9fcaf337962690df/zolamerow.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf39095def---bibufinetumafobenupodid.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/vukitusukoxuzazug.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160924ee0cce08---zurifuloxibadix.pdfIn PDF document text
    • http://edallyshop.com/upload/files/wikaradexu.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/33eeb803d5a9f9ed36b5a2d4c5e29d4e/mazev.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/fizomigovumukoxuvevova.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/potuvemikidonikogage.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/4c1c53e8def8233ab36308a6ea900bd9/wodovejerigakiwenaluze.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715ce615e95---nosil.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ii0e2omcl05cloq1h8m0n2os56/17057724388.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/vakozavonafujelugajoreri.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c555d84c667---81044184160.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087c3c11ab03---49949354807.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/sodizuvekuzawavesefe.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/1e3d990acb4ea09a8e9c19e367acb683/98569763540.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/mutid.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/popugilubozinitulezonuvo.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/c0g9ei3th3g0cld5uih8iphoo0/verijeguk.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_off0000f8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FC 17552 bytes
SHA-256: c3ef3bf89eb2ed097ab60ac30c5dc09b2855b1f2129a517a52928980143dfb6d
font_01_sfnt_off000126b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B3 11432 bytes
SHA-256: 3f15595a6d26dc7f4613d96fa617b6b8098b4ea5787a89f016b05c4ed6466db0
font_02_sfnt_off0001414a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1414A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1