Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52fc70abbc0f0fa…

MALICIOUS

PDF

406.4 KB Created: 2021-06-28 22:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ce9ce0662d991a250a74b0f8c87cfda4 SHA-1: 7181b62bd3800472cf4ea5ee5f3ec50679ffcb9b SHA-256: d52fc70abbc0f0faa314758009dd45599bff7d7dbdadf70407bc84d31dcde1e0
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing lure. It contains multiple links pointing to compromised WordPress sites and SEO redirectors, disguised as 'deloitte aptitude test papers with solutions pdf'. The primary goal appears to be directing users to download further malicious content or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8046

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://laborke.ru/uplcv?utm_term=deloitte+aptitude+test+papers+with+solutions+pdf PDF link annotation
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/0b903e4b8db49bf4d467fca29dcd7b62/mosebibejavasodar.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/4u4k6tacqh8dnl1sghdnka2llb/wofugefob.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4ae0aa334---2742953113.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/juzobeni.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/126d69bad5e07eadcb0f4e95df77c262/gajugiwute.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/6qihrchcoploivk31rr2ojkltj/16832371861.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160868fd168d02---46852863948.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/smp84oo88d5ab4tgth4n7dc405/kijisilaximenalubiriwixal.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/6c2ebeb6654cddd47ed8f6e1d92f44b4/89667249134.pdfIn PDF document text
    • http://chongros.com/userData/board/file/relusokirelebojep.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d045b45d5a---47358842475.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/53686428704.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a4e4e0bdf2e3cb917afe0ed30f5cfc15/dofanufofip.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607b307005228---fonagejuxek.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845c070269f---vujaditizofenut.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/2ff62fe4f26f626a66a083849ae6dbe8/juden.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/rarepofon.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/79159027073.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/tepafazirizita.pdfIn PDF document text
    • https://ckmandarin.com/uploads/53431073640.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f031e0ba7a1d01c0ace86769d32a92b8/82853784608.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bebd33b6dea---59628696678.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7085fed3df---jotegaga.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/41608185612.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160ab9a0c23398---62821765677.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0005d1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D1ED 18540 bytes
SHA-256: 28487ad2b79b45ee1d750a41b4ad9e534d9a036f28e37e7dd5e7b4eb972cc102
font_01_sfnt_off00060274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00061a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61A85 16080 bytes
SHA-256: b1c6688c4117b2eb132fe321d6e5c0cba7066824bbd4880a4905979a2499efec
font_03_sfnt_off00062fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62FBF 10784 bytes
SHA-256: 87ae254a089197d1520f0aaa764c440151cbe4b2c9041d561bfb90bb295ea498