Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad7f66385b8e751d…

MALICIOUS

PDF

70.0 KB Created: 2021-09-27 12:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ad72bf385f2d5a3a071754dd43ca2814 SHA-1: 9562a11b38855249508fb0360f34d0b90818051f SHA-256: ad7f66385b8e751d027b5fe6299983ba97c296cb08b6a4c83cb83542c97f1084
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing pages or malware downloads. The presence of multiple compromised CMS upload links and disposable hosting further supports its role in distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://philabc.ru/uplcv?utm_term=airpods+pro+android+microphone PDF link annotation
    • http://ebsenglish.net/_UploadFile/Images/file/90962402277.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/60109468819.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/2385186514.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/nosezesivotewin.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/45965456469.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4784a111ed3f3bd74f05440598a22a5d/17803782170.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/d1ab8ae96562f22f6c67a46f2ce0f042/nagomelowezafawefema.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/zikaxokusuwudaxun.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/53fec1ef6a0994194659f89a83b1b228/woxudipowexirewove.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/fumomefo.pdfIn PDF document text
    • https://fultoys.com/userfiles/bilesajafareg.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161319c06df599---gufetoxofonor.pdfIn PDF document text
    • http://retailcop.ca/files/wogoxokutunanuwevevev.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/xafotomejupowusareluzopu.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/vuradami.pdfIn PDF document text
    • http://slovoveri.org/userfiles/zefasewimozamudumid.pdfIn PDF document text
    • http://prestopc.it/upload/file/basekesow.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/luravozugevasawajezirigov.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/89416094596.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/zitolagebusekunezipime.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/63158277147.pdfIn PDF document text
    • http://smogy.ru/files/files/bupex.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF35 16988 bytes
SHA-256: c6cb0dd9bd0bc3e6e6ec0182b68f4479d890b6461188de13742c5e9718e9f691
font_01_sfnt_off0000da8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8F 10616 bytes
SHA-256: 0b55e9089acc5cf4c421b6681409cef5c72d2680c7f6cb039fb1c2dc14b7b082
font_02_sfnt_off0000f293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1