Malicious PDF — malware analysis report

Static analysis result for SHA-256 808eb840fd42a8d2…

MALICIOUS

PDF

87.3 KB Created: 2021-07-06 14:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c97347f656dc99f24a82871943680c6e SHA-1: 90cbd3e78f790a694a88b33ca8a66a1313e44e04 SHA-256: 808eb840fd42a8d2ec4f8fc3781cc44cdbcb54826181dfe8ec9228f8f82398c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/56669827054.pdf
    • http://ccswcd.com/userfiles/file/8120773391.pdf
    • https://panificiopasticceriabattaglia.it/file/14143057648.pdf
    • http://pphu-joanna.pl/fckpliki/file/sonivem.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-20/20210520200313387420.pdf
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/62270caea7142d8e10a6f4922e17ba17/kixafunefupunaso.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/76de0134a0f2359add105fea6f4cd069/11110913402.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609223db6e7f6---sorilemola.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5e28331d328b401f6259051e23bb2dbc/95043442002.pdf
    • http://aite-materials.com/upfiles/file/popazegefuwaxi.pdf
    • http://pune-india.info/userfiles/file/pamez.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe652c68bd---91451069695.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa3d642d55---57966865945.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ae290e47f---rumixizixipam.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1be66d5f2---doxumiwox.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/ab89454f16daaebb84ff058103315012/88258206577.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64b4163003---44974374076.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085da56bbc67---safefoxeg.pdf
    • http://alltechsro.cz/files/tusevijine.pdf
    • https://interior-mark.com/ckfinder/userfiles/files/gukizirurasisi.pdf
    • http://benly-carson.com/product/files/23727254776.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/fb4a8dbdd6fb03194292ef58f7bf9109/liwozife.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160737bbdd76dd---reradigexuba.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=sample+technical+proposal+for+consultancy
    • 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_off0000ed8c.bin
c9e2f44ae236a302ae3549077e28ce057cb8a4e6dd84e4a5c0447537260186fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xED8C 11032 bytes
font_01_sfnt_off00010703.bin
269ba51427c0c7cf86bdb60a2294f68766fafab974415d45fb5f104f23a06798
pdf-font-stream PDF embedded font (sfnt) at offset 0x10703 17876 bytes
font_02_sfnt_off000135d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135D7 16792 bytes