Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ce6b4e765d7d0b…

MALICIOUS

PDF

69.7 KB Created: 2021-04-23 19:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 83c492ea872fd418b5fd6d93c093a47e SHA-1: 81aa67e172a85fb75b252137f694a07adb15ed86 SHA-256: 52ce6b4e765d7d0b132aba900c635c7a0c18605b8e0dd3f3ff3e597da2cf53fe
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded URLs pointing to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to 'wordpress login shortcode' and 'wkhtmltopdf', suggesting a lure for credential harvesting or a disguised malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=wordpress+login+shortcode In PDF document text
    • https://ligibumifi.weebly.com/uploads/1/3/4/6/134647936/8268059.pdfIn PDF document text
    • http://rivuxini.66ghz.com/bang_bang_hd_tamil_movie_free.pdfIn PDF document text
    • https://luzulobopado.weebly.com/uploads/1/3/2/6/132681737/zapexirimun.pdfIn PDF document text
    • http://hargotel.xyz/why_is_my_hp_photosmart_5520_not_printing76d5i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494883/normal_5fda18a5315b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476427/normal_602af81fb1f54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489834/normal_5fed1b026d66a.pdfIn PDF document text
    • https://lukadivosegiga.weebly.com/uploads/1/3/4/6/134679105/lojowinib_zinenolifo_tomulepaz_rokorej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388598/normal_603ce72d33d9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365639/normal_60672a83e9c8f.pdfIn PDF document text
    • https://xutafutixon.weebly.com/uploads/1/3/4/5/134576274/sanimanijexikufu.pdfIn PDF document text
    • http://motivawka.online/jumping_the_broom_soundtrack_itunesik3ds.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450045/normal_5fe4831bacf19.pdfIn PDF document text
    • http://spindlndou.space/854822042136ek6u.pdfIn PDF document text
    • http://koolmaxt.online/83240168711897ry.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420743/normal_606987f69620c.pdfIn PDF document text
    • http://albatros-trans.ru/10_snf_kimya_esen_yaynlar_indir6tzoa.pdfIn PDF document text
    • http://vefatata.22web.org/tamilnadu_attendance_app.pdfIn PDF document text
    • http://nipikul.22web.org/causal_inference_for_statistics_social_and_biomedical_sciences.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://malusamum.rf.gd/angielski_dla_pocztkujcych_testy.pdfIn PDF document text
    • http://zapofekeba.rf.gd/riledafinovisolomofanex.pdfIn PDF document text
    • http://kedukalof.epizy.com/nucleophilic_addition_reaction.pdfIn PDF document text
    • http://mozutebileba.rf.gd/bakazigunetuxigid.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
    • https://developer.wordpress.org/reference/functions/sanitize_text_field/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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A4 5140 bytes
SHA-256: 95f441d39695131665fa40dd0016f9136700dc0777cae96d706c0b06fcb21e8e
font_01_sfnt_off0000e329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE329 10632 bytes
SHA-256: 4edd36218510eaad48bda849b48537e2b4a91777c89251b55da6b839ebb4b463