Malicious PDF — malware analysis report

Static analysis result for SHA-256 0954aa7af1891c1e…

MALICIOUS

PDF

84.4 KB Created: 2021-08-17 09:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ac6026890d40a847f3f63b233ed7d19c SHA-1: c350cfc721767e62735fbd093681c5cf26a3b38a SHA-256: 0954aa7af1891c1eb9febc124f445061cd34c8908ab5e8ec40bd69f191a35be2
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The heuristics indicate the PDF acts as a link farm, directing users to compromised websites and disposable hosting, likely to facilitate phishing or malware distribution. The presence of numerous URLs pointing to PDF files on various domains suggests an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.tekkoo.net/images/library/File/jinosotazoj.pdf In PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7ee3e7ecb---49869131877.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a184851904b5f1ee4d279f3548ed0ae4/13185769169.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/5608144618.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/cfilc5ev6lrlv9tjdqtuko2rcv/tabevimejarojirafedirera.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b9cdc1c4e---70165591358.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/64967456363.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/0fd5d8aeb7858c02780efbe5fa838aff/jeripenidovexelugoteke.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/d0vop8ldut9nr5q0ais8os0rgv/11498075416.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/72050681630.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5b90673dc---77080695449.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/44262663206.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/dutonuxufid.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20217101030211873.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/90613077933.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/67481907513.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/93006781479.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966d6569fc3---kojomufotefowukona.pdfIn PDF document text
    • http://simoncaulkin.com/images/27512053327.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/1679368012.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/wajivabiluwugupa.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/luvaxapedekovef.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/fivumogebusanemarenewap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=download+bluestacks+1+old+version+for+windows+7PDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D7 15956 bytes
SHA-256: 4f72d4566be617dcf95b968a1454cfa8825beefdb2e005a47e85b04f6e663214
font_01_sfnt_off000110dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F3 11056 bytes
SHA-256: 9190260ffd51fcca078e2e7024483734ef52487f01885145529e94a6d280a241