Malicious PDF — malware analysis report

Static analysis result for SHA-256 4afec5677180be33…

MALICIOUS

PDF

76.6 KB Created: 2021-09-20 06:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5ed358564183407fad93d79b876a1b52 SHA-1: 193da224081d9b9c396ba5c8d7770be2c039caaf SHA-256: 4afec5677180be33fe1ff136920cdb3da3e272361fd1ddcd3f18c067b0d094b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of multiple suspicious URLs and the overall structure point to a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://pixomot.ru/uplcv?utm_term=vibe+streamer+android PDF link annotation
    • http://ityab.com/cache/fck_files/file/fefiwatax.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/vokesevazolukowarev.pdfIn PDF document text
    • https://suksesunited.com/contents/files/89241340747.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/suxapifazatatoxozita.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77520242749.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/42935260383.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/517449b0c0ac05f99f38eb006f8f1969/90136308031.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161308f93a59fd---37127281867.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/960986698a30a9170c8eddc5a668b277/devatijija.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/janurexuvefezotemapo.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/44392784503.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/bejuvajaxekuxibu.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f39a990772---67956607758.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/90488094807.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/32969041888.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/58318096010.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/23225331132.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/92661108760.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/tiwudo.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/66275044737.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/1d504ec5e7ee9387ae408c7886085d3b/45172485050.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210904020303_1779116553.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/10391459330.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/16990040691.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/23939288688.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/xubafegijemit.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/jojosofamatepixexeburiwa.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_off0000c6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FB 17796 bytes
SHA-256: dfa75db6fa71a75a1edb6182085b319a4b768df0305f9ccc8cd314081fd17256
font_01_sfnt_off0000f56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56A 10472 bytes
SHA-256: c5dcb44c6edd3e6de8cdda614672daa086f0b7a885898f9dd966c316061d4bd6
font_02_sfnt_off00010d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1