Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3bc571821fe61e…

MALICIOUS

PDF

75.3 KB Created: 2021-09-07 16:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6ab08438f9aed026faad328446f7cb53 SHA-1: 0042f0070b753222bb8af5af61f7866201a00a42 SHA-256: aa3bc571821fe61ea817fbc09bde46adc0788817fdceca84e1d450d730c7445c
156 Risk Score

Malware Insights

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

The sample was flagged by a machine learning classifier and ClamAV as malicious. It contains multiple links to potentially compromised websites, indicating a phishing or malware distribution attempt. The PDF structure suggests it acts as a link farm, directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cybernet.asia/UserFiles/File/lojexodega.pdf In PDF document text
    • http://artecgroupservices.com/imagenes/file/47021571598.pdfIn PDF document text
    • http://xycrusher.com/d/files/xovefazufomabidesawifusix.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/zajesub.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1607221dcc1ca7---tiforuwipuritale.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7af0e8980---wafakofid.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/tetik.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e09a670c73d---lenuvirepuworadezesemo.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/72334886338.pdfIn PDF document text
    • http://crediramasrl.it/public/file/jifogedefoxuwapizupenamit.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a8ac7560ec7d806ae55d1ad30993629/bolerogulukobaja.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/jesonadadulere.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/wixegivi.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ff7adb25a---51056310175.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/12955974521.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/83705668700.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/modimogizetaxulo.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/fevewere.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/73510074439.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/vatowakujikuvoditewube.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/15289133743.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/nalepe.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edc603a81ed---pozejasab.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/99314337147.pdfIn PDF document text
    • http://hkwwta.org/userfiles/tajidukibenid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cahier+de+vocabulaire+et+grammaire+pdfPDF 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_off0000bee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE9 11132 bytes
SHA-256: a8faabe51116a99daca8044bcfdcf923703c230ce022315dd3dc6b59e3acdd1d
font_01_sfnt_off0000d87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87C 18320 bytes
SHA-256: 80f9d6db4ecdd7f936e9ab47550b9e4abad7018ea9413697763f3c4300f348ce
font_02_sfnt_off0001074e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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