Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4547b00e19a8111…

MALICIOUS

PDF

88.4 KB Created: 2021-06-29 00:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0186ab1503e2962b81b3275a9621d49d SHA-1: 7a286580b5c90844fd4ad91d4c0bc746d42c894f SHA-256: c4547b00e19a811119da85a48c4c81c32e18cffa0fea44af32f8fa86fd30b289
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve to distribute phishing content or download further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9117b74aa4---gosemotodim.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4eec575101---64645809602.pdf
    • http://www.look4job.gr/images/_user_na/file/zikumogebinivuwa.pdf
    • http://web68s.com/upload/files/toloduposilidobolapep.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/228265b653b9f26fc904fd3fde092730/34975886624.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/9dab7090fda90e030a6577fd23afe95c/46900004592.pdf
    • https://harom.ro/files/file/68805342973.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/k95n73s8ffckccgbpfcisq3185/doruzonifumipesi.pdf
    • https://bilalyapidekorasyon.com/userfiles/file/59055411714.pdf
    • https://rijst.nu/userfiles/file/mudufipulufa.pdf
    • http://noahjohnsonsark.com/clients/e/ef/ef24418f2336b9480f3353ee42fa3f58/File/57896528627.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c14a2dc9459---mapexuwe.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/cb00d5edd98e2de6f55a1f858b6bdb4e/fedoxivopi.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/mrr3b4a61706cqc51rhdc76nt5/bizawexo.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098404fbf5f0---zuxorujefowepolasaja.pdf
    • http://kasintorn.com/images/upload/files/23566094871.pdf
    • https://rumusjitu.com/contents//files/84399538141.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/uhdgrto0tl3frt2mhac9mm7ich/lasixikenisolewikabikezuv.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160876ef475f10---21284003595.pdf
    • https://etonbio.com/newsLetters/images/file/nekukemumowibuxabaru.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc8510cc0c---kiwafogefawubirakaxutubas.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/bce6bfeb4053377284f40c237792bc00/7178697331.pdf
    • http://waukeganeast1980.com/clients/877304/File/refibagawozuvur.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=dimensions+of+a+standard+bedroom
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f79b.bin
23287129cd6e9ab21696e94f6aa715e9cf7d60684b1062fd5a9f034ae1059dcc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF79B 17108 bytes
font_01_sfnt_off0001244d.bin
d5585a1a25535fe59bfeb18801f5d5a40d8b5efcd715afcd10ade2308ee803df
pdf-font-stream PDF embedded font (sfnt) at offset 0x1244D 10608 bytes
font_02_sfnt_off00013c89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C89 16792 bytes