Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e3b4f211e1d336…

MALICIOUS

PDF

84.0 KB Created: 2021-08-07 09:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8314e10865164eb190175beb8c60d706 SHA-1: e43f6cb049e1138cf5d7ee532761b9ff2e0eadfd SHA-256: b8e3b4f211e1d336c1084266625fc3a0e22fd94896980448b1bca4f04e6acf7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to various websites, some of which appear to be hosted on compromised CMS uploads. This pattern is commonly used for phishing or distributing further malicious content. No scripts were extracted from this sample, but the presence of multiple external URIs suggests an attempt to redirect the user to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://synerhu.ru/uplcv?utm_term=calculus+graphical+numerical+algebraic+finney+demana+waits+kennedy+pdf PDF link annotation
    • https://dietacud.eu/upload/file/85209460449.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/kofol.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb15a88b970---66814052144.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/mecjjosqgd2fhmj02q3gfrb8s4/vifaxapoxak.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d60f6aa23a0---38397412116.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e194c6ab14---jirugidudowupugamebevogoj.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/sovodofojonawokonosetiro.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c53b80b07a---25017472302.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce61f711806---17089816023.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c64ff802d5---fazivuzaterukivo.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/famevorusodozezej.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/d4c48ab7011e4bea24133193539ae7e4/67408635430.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/duwex.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2f5cc9dcc---devuridunirumilewupazof.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/kezilu.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/firadusubutaluseli.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/87392121441.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/85522952959.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/54932232673.pdfIn PDF document text
    • http://nensi.si/upload/file/rokulutobomuxa.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/e1e593c2e2f0a60dc44184a7784b9cf5/visivumakadoruxowen.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BE 11508 bytes
SHA-256: 72ddc67b76d25cb62ebe1a88529cc56d1092370f41d673ce673f5ef145db2e0c
font_02_sfnt_off0000fd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD76 17680 bytes
SHA-256: 6c7f5383590ac0fb8eae8c2ae9c61d0fbaeccd1fc0c878e313fe6cc1f3e08af0
font_03_sfnt_off00012bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB1 5724 bytes
SHA-256: c0b55cde2f933a57b4bebda79d256188fca8cb34845bb2cea802c71802aa2ab6

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