Malicious PDF — malware analysis report

Static analysis result for SHA-256 779419c5575b138c…

MALICIOUS

PDF

85.9 KB Created: 2021-07-10 06:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8cf7af50594f7ce146aec74dbd3a6617 SHA-1: feb040808a84cfa1bc6f2ec6a983321842a2caa9 SHA-256: 779419c5575b138c2862f21350896a62e4df39dff1a3dde898dd265db381121b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of multiple external URIs and link farms suggests an effort to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://niboparis.com/upload/fckeditor/files/sepaxujamejiferi.pdf
    • http://kaowei.tw/image/files/20210617_020135.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/2bus78r4ur0a4eoiuvblc3s7o2/wizuwewuxibonebasa.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/5f535655c1215e9faeface1767e21297/godir.pdf
    • http://konyaozgunmobilya.com/userfiles/file/dexodugeboduluzawubu.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/8e6a4d50d30a6195830328d0d6c83616/nisawirusuletakelumip.pdf
    • http://tipsclubcr.com/campannas/file/52594762609.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/b66e0bd3a1115a30a1d157663ccce4a2/70621316823.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847b5f653d9---konoda.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/t5n8i0ea4ljsjh5p3qg7c577th/zanenugot.pdf
    • http://airconbank.com/upload/fckeditor/file/rupixurotuvexura.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af3d674d0c---39163591125.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/dfe26abf89685e434f10a333dc2c33fb/wowidiwobibifaje.pdf
    • http://insfilings.com/skyzone_classic/upload/files/30160163828.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/2eblmiih5dhc2evrb3gjkkflc6/bumimovinafadisuvut.pdf
    • http://jngf.cn/files/file/88146853939.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/pdaqpte5vpp6jal2946bbstujg/78291488391.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/6e28e4960db648dbe4e4085ee64c4a87/10947561427.pdf
    • http://grawerlik.pl/userfiles/file/28313371372.pdf
    • https://lacecinella.com/writable/public/userfiles/file/37731906509.pdf
    • http://izumrud38.com/ckfinder/userfiles/files/27103507209.pdf
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/3505600628.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096ace5d5975---54508696213.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=dbms+is+a+collection+of
    • http://s292376414.onlinehome.fr/datas/imgmail/file/detaxinofired.pdf
    • 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_off0000ec7a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7A 16792 bytes
font_01_sfnt_off00010491.bin
28f2b023f0f9ce7c63cb116a0257ff267733a3c4739245d342e41d5a86e42788
pdf-font-stream PDF embedded font (sfnt) at offset 0x10491 10536 bytes
font_02_sfnt_off00011c94.bin
eae507ee08577549e0e9525fa6d2a0e8098774d2143bfadb517dfdb4484422fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C94 17448 bytes