Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccc895a354f87022…

MALICIOUS

PDF

85.0 KB Created: 2021-09-18 15:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: babc6879a5d75f7715d8219406653384 SHA-1: 8cb50f6ed802741915ea20814ef63361403887ba SHA-256: ccc895a354f87022572c0dd316147b71a9a481f0af7b6908255ba3c2a735f106
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://medvor.ru/uplcv?utm_term=how+do+you+make+a+custom+live+wallpaper PDF link annotation
    • https://computerzone.pk/file/72930107088.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/9671932104.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210911055745_wb3g0e.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/93760578171.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/sikekuvosuvi.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/82647472767.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/kereduvegizenexilujupiwe.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/pumuxabezezewukifitipimen.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210909134506.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/rutugereder.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109141822499480.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/un40uuu0n4f86hipuh87moq7ei/93424175970.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/97197610920.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614142c86dede---33173524507.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/84bb086eff0fbb56b8e4da277b447ac9/50003166147.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/51023976915.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/potikesejugirilidozetala.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/2032668190.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/25399603957.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614193727f8d3---63912344469.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/45801379987.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/45991029634.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/96275276463.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/22945789481.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/sanarafikodasesisowa.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/28751f3b6ebf7dffa993b642bf5fe4c6/foniwukewelitose.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_off0000dfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F5 11020 bytes
SHA-256: f02e0cb7bbaeec967e0c88cb7dbed273bd4b55ca03e99974c99c53e66ff222b4
font_02_sfnt_off000111a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A2 19972 bytes
SHA-256: 5804a10e0cfb16e1a864b8f8760814be919c881cee5c227cd856861ed99b5ecf

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