Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf2d71d309f7329…

MALICIOUS

PDF

90.4 KB Created: 2021-07-04 05:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 047bda6e75f69033ed36744dae17bc57 SHA-1: c94fa4340b89081b7ca543affe04d9746b325353 SHA-256: 6cf2d71d309f7329ce9bb4197258cf3cc7304a7926016da49c82b93a7a4003aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://emke.hu/uploads/ckfinder/userfiles/files/21440560634.pdf
    • http://hanhthien.net/uploads/file/33923212042.pdf
    • http://amdind.com/userfiles/file/pelozojaxeduroxikawajeb.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/144f4a8790ee856cf919ef37af65cf6a/lanufavijosutelepaguravox.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc82b48e97---jenejago.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ba277d8fa---bavikusana.pdf
    • http://mxm-hosting.nl/img/editor/file/21807392773.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7222ceac7---26860708327.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/871a56f177fb041dbbc18cb479b15bec/39276520871.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af85d9bbd6a---bibonodasanafikop.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084983c13d85---93604766067.pdf
    • https://chetanaus.org/bheru/uploadfiles/file/tepukikuvakipixinivo.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/0660fdcb3b481967ab53610ec7b4067d/tinijovawifizeroret.pdf
    • http://safaraval.com/basefile/safaravalcom/files/50716616084.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3afae53ad---rejawesajagebofizalolok.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/eaee830d09406a789fd20b2df041e5d7/20617644123.pdf
    • http://derkwoo.com/upload/editor/files/fuvamokofabiwebonewonoro.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/i7poqjhrg9bck52lh01f6fe5km/piwavobupixaw.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d8d098140---fepunugo.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/252a4f9c5fa1e3b0a50efdc8d1c6094a/87184673501.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/3e60ea8379f00b842e5ca320d0c0e81e/38357523611.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/i1g1gikuibcim74h4afpm3cfb7/75509030597.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077db8d4741f---5445983114.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/h32j9b8g99o2pgdq7viqgt2kap/kadugerowor.pdf
    • https://moveo-sport.pl/userfiles/file/fivepubevuvalopujogoxem.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210611163139.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=island+of+the+blue+dolphins+chapter+10+summary
    • 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_off0000fb26.bin
8c6c68f4eabb31430029ad8cd967cee9708ffc15be37dc22169aab5c6ad18b03
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB26 11364 bytes
font_01_sfnt_off00011586.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11586 16792 bytes
font_02_sfnt_off00012d98.bin
cf76c416aba3e3242243acb029051eef1858903bdeee649ec1b446ae3f7b8122
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D98 17604 bytes