Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee0118b939fb69e…

MALICIOUS

PDF

99.0 KB Created: 2021-07-19 23:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23cb9fb9b8abf78becd511ed69576801 SHA-1: 7123eb2c241edd9f6ed77308800899c6c1e2f263 SHA-256: aee0118b939fb69e07f60f0f016bd675bd74374d2fbee12b64cc707af6d117ea
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for further exploitation or credential harvesting. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://mousike.it/img_ins/files/kuzisufoduregupimugad.pdf
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/lexif.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/910c340182c9e6341439257aa174622a/12439870230.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/f01d4eeb87eab732f1a3de97e844d987/40549502962.pdf
    • http://uro-medical.pl/zdjecia/fotki/file/91123606480.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edc7baad49f---86548404362.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/66decvk7cetfldfot8ag37lj4h/97680924773.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1a5c9d133---gijogowu.pdf
    • http://ahkjt.com/upfile/file/90680790013.pdf
    • https://dsverano.com/UserFiles/File/gezikovumowiwavazo.pdf
    • http://acpiindia.com/userfiles/file/nefewofifevezukagut.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607701162fa4a---36335889620.pdf
    • https://jjcfurnituremaker.com/userfiles/files/20779398976.pdf
    • http://www.awakohchang.com/image/upload/File/5335218018.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/13a85e3b52e1a373a6dbb43b6b2dec57/nuwuze.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c16b23f6c---56856685542.pdf
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/lanomopinilugevu.pdf
    • https://hojoairport.com/images/file/79777685512.pdf
    • http://jjkxmy.com/upload/files/202106290146393913.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/1td39nh1jc76ot5r40gk1t02nn/87505043809.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6304e29bac---16416754148.pdf
    • https://fasaac.org/temp//files/vepawodejazuzawi.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/mpc5caop3fs2rcq0v9229r503d/13044152959.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/803860210bc0c3b2681a0809e3f84933/mivupi.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d7bd2c718---77861680175.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ucits+and+aif
    • 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_off00012336.bin
7db6c6a25971dc7062823bf96a344d8faacbc1e6decbaf60069d988611ddc099
pdf-font-stream PDF embedded font (sfnt) at offset 0x12336 10076 bytes
font_01_sfnt_off000139c2.bin
e00b2c6bae8d6e1bb86491153e03111be9b94c5d528f7200ed52b365f9f052da
pdf-font-stream PDF embedded font (sfnt) at offset 0x139C2 17324 bytes
font_02_sfnt_off00016716.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16716 16792 bytes